Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fef44db17d03bd…

MALICIOUS

PDF

91.2 KB Created: 2021-07-25 00:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a42a3dea4144b28ed25994f08ae67352 SHA-1: 95e692c73135e278cfa6ffcc75ad7a04c6cbad8f SHA-256: a5fef44db17d03bd64a274e0780a3fb134209e3764a7fd7ff03b6662cd11f4e1
184 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to host and distribute malicious files. The presence of a 'download button' lure further supports a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://artetendasud.it/userfiles/files/44949708403.pdf In PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160941ebeefc33---vulupirezokuxuwipigofura.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/278a2b76d9a418f9aa599e5b99653ac4/47877364305.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/jogekaxejumukavowak.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jisometezaj.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/29751997597.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/2774054392.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f52c448af0608c509b65d5fe24b90dbe/lejawe.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/rerujagewotonisizokigasoj.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160786a1ce0918---nodazemurogox.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c26b54f31aac46dcf624c49fe1b13241/58709903103.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/30982737203.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c147d5b9c15---wakomom.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/18749037737.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/34787717401c67a302a057a2cf0ef1a0/vujusojatimuzu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cf05439024c---50318735010.pdfIn PDF document text
    • https://coluer.ir/documents/file/89041366285.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a7a444899---sunok.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0ehai70e3olndstd9bil6ggas6/sasalidibaxagunilutik.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ce8d487c8---92829924189.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/83687289480.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/mujedivez.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/7ffa1b137ae7ccf3c116d97107b3695e/wusufirewawegegoxi.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/nowevalemokabanavubinu.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=holt+handbook+answer+key+pdfPDF 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_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 18196 bytes
SHA-256: 91c8c27c88b43dba324be75e0b5eef33b113d15a7c2d5aed77fd6ef2bcdb7f77
font_02_sfnt_off0001450b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1450B 10924 bytes
SHA-256: 97dfcadf38bf87984a6f7ea263bc42699ec9fcf66200ef468c1e13afc71b7b23

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