Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4516f2da6877a17…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 15:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d6084925df667f9d520368a03ce69f0 SHA-1: ba4f18ac923c1ac72c5b2a09c059779749fc2abb SHA-256: a4516f2da6877a1773bac9c096adee3dd23ba3833759c1d414baab3a5f4178b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the link farm heuristics point towards an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 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.
  • 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 http://irk-yoga.ru/upload/files/25684810776.pdf In PDF document text
    • http://ecohost.ru/pics/images/file/61962538805.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/70234d260c08b95b75f2f3b66d39ab79/kadopebewis.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/12427286265.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/19266991641.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dc649c87d---mosokizodenunumado.pdfIn PDF document text
    • http://abnicum.com/files/file/68877924684.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/9245397904.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa215d273cc---fapobilif.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/78313361853.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/3frtu2a0vsaqvi6ac49b66et14/tupegaxevemujeb.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a634159f107---lomuvulepo.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/sosimena.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/rolibomowuvajakedulilumib.pdfIn PDF document text
    • http://stonebreaker.at/nerewurifonugo.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/josib.pdfIn PDF document text
    • http://inercial.es/uploads/files/wuxarodokerenuwowokijata.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1188b4e7d9b0d92057ad394a37f88ed4/ginobamaxa.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cb49c058df0---sojis.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/witof.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/tumul.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/77250665332.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/2247603629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=igneous+rock+worksheet+middle+schoolPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 10884 bytes
SHA-256: 0404dbf95580fcc03405a5ca1c009f50e5ccee190fd1d66288cbde8c7a5e7227
font_01_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 17860 bytes
SHA-256: 8f313df4b186f47eaeaf2683dc6cb32a43a3a932b3efee7fe3a23dfbdc031758

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