Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df778f23a99a11f…

MALICIOUS

PDF

91.7 KB Created: 2021-08-03 19:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9b4f0db6b96463e2e9ea6be85885afe5 SHA-1: 7e33adda0f2a6261d121bea668c4ce729939462a SHA-256: 4df778f23a99a11f0e870742f2b609d04f5d2b83f30c2f8a79d619170c673a59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to compromised websites, specifically targeting WordPress upload directories, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84199e621a---67191563147.pdf In PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/55843317077.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cfc930e866f5bc388b73c3b91d1159ac/47660047807.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/sce6pp512mro8abrd3nf3sos0n/87841140894.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d530a25f987---42157058443.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/b43130188133c59f7238e893ee80be4f/wetitero.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b2a4a6347---44690761023.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/gegetenovufusemifewase.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/86089638452.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/siburoteluxobulumiboxodir.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/gewavomaja.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba4caa4d74---xitofamozirivi.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/32272946286.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/womisolusurisivurofeves.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a5ba89dc---99323609983.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/katifebuwivabivetobolo.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608496305bdb7---beforolifoxevalufo.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/gupojowuza.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/69181050588.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/banubujivenakodefudixezo.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/tidazitefube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=b1+german+book+pdf+free+downloadPDF 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_off0000ff65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF65 10908 bytes
SHA-256: db2c3f24980aa586b30e83ae9d782cde1251098428dabcab5372caf2d3948191
font_01_sfnt_off00011846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11846 19004 bytes
SHA-256: 3f9589f4562a84c27f64f35f2c0f761c99119c714b924d0ee64cd9a43688c353
font_02_sfnt_off0001483d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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