Malicious PDF — malware analysis report

Static analysis result for SHA-256 6923daa079153cff…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 22:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2dd5c41ccad20bf20889d2a597b66193 SHA-1: 5f1dc0b44f3990ab51ae8a7a8a20b9c75e7d1605 SHA-256: 6923daa079153cffa975ad95f5bdb7891d698e034ef83fe3ea8af8467d7b3182
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The PDF's structure and the presence of external links align with spearphishing attachment tactics, where the document serves as a lure to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=k+12+computer+hardware+servicing+pdf PDF link annotation
    • http://pratiklinik.com/img/userfiles/files/xateberifuliribime.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/024a0bbb6f7675b3a83243760ef46771/tozotufepajej.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/xuzuzejozavikat.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/lowovosizumuxap.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/48024658610.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aec198d76b---tijebo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d20cdcd38c2---72665324799.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/73498301136.pdfIn PDF document text
    • https://7gking.tw/upload/files/70949964787.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/95441856803.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/menevosavulunetowodebam.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/51869841658.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/92459174101.pdfIn PDF document text
    • http://megalaserasia.com/upload///tufabotazozu.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/97794885414.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/banigi.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/45455204047.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160780563c7f8d---botedunufutasapidubu.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/pirag.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5ac5f5aaqe4tdgkavfpdkgu5dg/zejiniwobujegibev.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/63008036421.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/54321b2f8b9ee75bf7408364c54f57b4/ximoxijupawilamilaku.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 11436 bytes
SHA-256: 485af2473d0b310d004b6731ad54d2c6d29eae5ed096d6d17e613347ced03c64
font_02_sfnt_off000108bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BF 16672 bytes
SHA-256: dab3b3b470098bc93e295f0812dddc25e24475b8df8a2a78c9d05b1dbd7da849

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