Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2628257d01163d…

MALICIOUS

PDF

88.7 KB Created: 2021-09-06 07:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1b2cc7478b575d30e0d7210057fc5b0d SHA-1: 57dc76c2daa18e04ad6d240e8540d5b184182fd8 SHA-256: 0a2628257d01163d0b22918859190747fad2f4cca40d7defe4c3f954483c297c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains and appear to be part of a link farm designed for SEO poisoning. The presence of a "download button" heuristic and ClamAV detection as "Pdf.Phishing.Trojan" strongly indicates a malicious intent to trick users into downloading further malicious content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=convert+docx+to+pdf+c%23+free+library PDF link annotation
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e97dbc06028---57953725209.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160944c0f5779a---28231491441.pdfIn PDF document text
    • https://areicon.com/images/file/26646898268.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c431978d0bc---21304648257.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/lirezesofoginusofob.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b037c32def---19792264916.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/vavabe.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/be4dc0f7a3a7be19db09475360e97404/49851780812.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ba701285e---27811641713.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/quee9rcfdvmi8q4kdi83erut6s/basezodopiduliwogoxale.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7e7910c01d693ed26835ead00c2958ae/73431482712.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d8e06988ece40a0292ef05b948c95dd/92419892555.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d7d5810b5---48615012977.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/57325310469.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/23391312117.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/41231209045.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jives.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/sirijexebebati.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d178291f1b---51054508517.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/bigipumefimefej.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/40340580113.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/lowamojal.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/jpf93bf7l09fobc5p3c23tctv4/89680259491.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7421a52b19ba368fe813835d8feb9f4c/variluxosiridezezasu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 19376 bytes
SHA-256: 2dcc75805779a9dfffd2017a288b23feb105aed50e02042309905bd85ee8c174
font_01_sfnt_off00012629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12629 10344 bytes
SHA-256: 3400625ff91a80a3a96c351d2d2a2671f7f352f55f97750667bdb35a3c2de8a7
font_02_sfnt_off00013db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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