Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bd0a77be5e4fa8…

MALICIOUS

PDF

88.3 KB Created: 2021-06-27 15:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2eebca5ac486f45f25b467ea4ebccc79 SHA-1: 3e4a37e9a176be78288fef6b3a0f88d66b49b61f SHA-256: f8bd0a77be5e4fa8f4675d8e178f796309e868d5fd0ff1face08f7cb1958df9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a redirection mechanism. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dzbnf.com/upload/file///jukoruperogujovagijuzomi.pdf In PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/jue6203n9n5jfqir9i3h0lr9n2/rurikik.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdc3b7a95b---13693318315.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f1f8116258f38052fcf44d64e1e7cf9a/sunitukulepijamu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160903e9667133---sopadokumobegosul.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1cb741f39---37957048533.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/11583327078.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608802a9b69ee---musokanawekimodon.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/6655482284.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160798b4c812d1---20654315432.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/63349170182.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082b2c97d963---rijefanuxot.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609491901f4f7---79565399892.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc141b3cf---94976479900.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/ddbd5d0f28d48e26b99b0d63ce01f329/13635146091.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/fefaxaburibipu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/893d57f68ef9a387a1a76a0ee381dde8/31215051432.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/fc2a885c1361b5d50e4dafa5ec493b98/luwelen.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/86427136015.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/80314185799.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/df9fsmi6ofb3n7j0lp7m973530/tixenijiba.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210620062221_yhsahc.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082d44dc83c3---31120514960.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/xuxatukeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=yellow+triangle+with+exclamation+point+in+carPDF 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_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 18008 bytes
SHA-256: d9fd7f0af92ede3a80a6273adc6e8dd6ea9974b68e1f5babd5bc7766b63f5733
font_02_sfnt_off00013915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13915 10824 bytes
SHA-256: 1bc6d91e6fa2008502582ddb88cfc892809a710d5558bb1911fafc0c00160731

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