Malicious PDF — malware analysis report

Static analysis result for SHA-256 6772a292492cba8c…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 15:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40dccc8fdbd57ad8c1aa41fc8e159c69 SHA-1: 69a944cc5de831b3b1a2cbbe8e0dba4dc0b70d7a SHA-256: 6772a292492cba8caa5fa2a7b4ff087642c591fd764dca98605d57c5fe9c8ecb
176 Risk Score

Malware Insights

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

The PDF contains malformed streams and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file likely exploits a PDF vulnerability to redirect users to malicious sites, as evidenced by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://smidgel.ru/uplcv?utm_term=dermatite+at%C3%B3pica+infantil+pdf PDF link annotation
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6cf51a0f3---gagejurijudotipuxuk.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/33371942828.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/14916789565.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/cf483c0145ac8700fad5b981160abb02/5986205362.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087b368b374c---libumubab.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/loresozavu.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/62380845748.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/65760046769.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/29546220009.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/pjr35td6i6rn39tvr1rb953uv6/xazoriviwet.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/b1gblgu96eovc0kfg5b9l3h0b2/87262968738.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/31908794267.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/37356229082.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/guvareribukuzavuviw.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da741ab4cb---90606129869.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/wenobegonurosowawowejaxu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/59c61ce4830d7a84c2fa2d3af67db790/lafipefakijata.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/98656483654.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161211b57ddbdc---2676807121.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/24801706673b90d2e1eb3912bd4587da/28142587876.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761bbc0d742---budafisu.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/83572576997.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/gerugiketi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab7d890793---gemaliniv.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_off0000be5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5A 18048 bytes
SHA-256: 35a08df480466a5f3ff9c9f2a277ae4b0fa9cabf3d6ba75989e1c10dc76ba88e
font_01_sfnt_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 10632 bytes
SHA-256: aabb9bdf0aca071ab242a35401eca0de8bc98d196a009e3ac2830c797d89579b

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