Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ccfb71f67815e4…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 10:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0401d0af6e261f1a937032f700b791f SHA-1: ca8d69ff66661851cc5d89642150814a031e4985 SHA-256: a4ccfb71f67815e40a682298bb711a462e874accef1fc7f481bb38b8c8a79f6a
164 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://laborke.ru/uplcv?utm_term=watch+football+online+app PDF link annotation
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161499504413b4---50493605849.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/36443893570.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/penanomexekizafo.pdfIn PDF document text
    • http://eventechsite.com/files/files/62277736433.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091419072173.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091121230079.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161476d5534ffd---28871461599.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/xisaridemutupijufuw.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/pipuzolazivuxir.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c77903f72---89467703694.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/nuvonikadaxipapetitil.pdfIn PDF document text
    • http://saint-party.com/media/file/8348923510.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/nagiribigitirerox.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1614761c4b689e---punixeluzidorini.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/89359925637.pdfIn PDF document text
    • https://tarsiman.ee/files/file/romugaromowogotezitoseg.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/45825737781.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/negejanuwogetuzugibixotu.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/57849763300.pdfIn PDF document text
    • https://togeltop.com/contents/files/23284332095.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/53200630458.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b5c9e8ddd---doturu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f40340aa6f---wuvopunebulenuk.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_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 10440 bytes
SHA-256: 189320a03c7bb097446b3513dcf470f8c06ec6e3afabe26e50f3cdc5b7b4e387
font_02_sfnt_off000116f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F3 17444 bytes
SHA-256: 45d0dd1738c86528596c4e7b755989d408682192e4e688c5e7346084e9a3764b

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