Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f7436310b835ce…

MALICIOUS

PDF

88.0 KB Created: 2021-07-17 23:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f8ea7193d90b9f9b1ab1e936bf4d447 SHA-1: 506ba6c5161070e216326dcdd3db32b17fe9b3a9 SHA-256: 77f7436310b835ce5aed8b5db97cf588f3973929e9196e4b69f419c022caa9c1
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The PDF structure itself does not contain readable text, but the presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8037cf37c---diraxedowezikija.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d905c2b4de---89791337108.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bc0153c3e---6043767029.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160784eb42dc4b---42095510080.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a87ac0ad6b5bd8e714a4c5728eccaf88/54276608321.pdfIn PDF document text
    • https://stvorki.ru/files/file/40358150636.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/43822956582.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/52fd8e0e0ecbe3fca4645cfe9b07c2b6/pofasevok.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/1n65m63oohvoq6m2suhsj36qn4/80390379452.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/82558184883.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/61235557771.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/paronowuxalid.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b5f8e6d3e417850003718f105fb7a8de/74680344244.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b68d088e---16431283755.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/98130155553.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/74499167475.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/jiwam.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd89d559843---40048908344.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d199301ca---lunerejifixoden.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/vasubezelobolod.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/60432197346.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/telikazolilopofitepasosub.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/gumumiramisiverufazeligik.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea785aa28d---gotasuwom.pdfIn PDF document text
    • http://slsnn.ru/content/file/kalem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=all+we+need+is+one+night+togetherPDF 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_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 10432 bytes
SHA-256: dbe5379c95140b28bf001789237c47d5ea4688c57a6c0a7fd71f6f72badea116
font_02_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 16976 bytes
SHA-256: 16c59406ac2eae5ba60f5675bce14c997027eebcedcb13188f039ece84c0c1b3

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