Malicious PDF — malware analysis report

Static analysis result for SHA-256 5579d7f80345e627…

MALICIOUS

PDF

99.0 KB Created: 2021-07-01 23:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 507588b563d106562b065930795f93a7 SHA-1: 8afd887e954c9aefd89b15dc334e0ad0a81494b8 SHA-256: 5579d7f80345e6272e834ec819411c8a6363feddc82e31b06cb9ad9fa85e972e
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it's designed to lure users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of link farms and compromised hosting indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

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://catamma.ru/uplcv?utm_term=meaning+of+hypnosis+in+english
    • https://rumusjitu.com/contents//files/5035071904.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/049617a0926de925442d624b419548c2/21219810273.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bbf48bed8---pikujap.pdf
    • https://ms01bet.net/contents//files/71021333029.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac9951b30---44641329876.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829b482adca---makibu.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc15d7f2272---72185362264.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9edc665c---49025036390.pdf
    • https://paklya.su/design/img/upload/file/kejejemunafa.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce55d89ae---junikaga.pdf
    • http://goref.ru/files/file/bizakulabekivanipotupetem.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080dc27987ed---gopoletupobekinidoxo.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/10e7fa78dd180acf9fb53ce4f5ed27c4/zewuwezonenikupilaxafad.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b054347e---41201650103.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40e9ea5aad---bugejavopilax.pdf
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/danolan.pdf
    • http://akinmedikal.com/uploads/file/75319570406.pdf
    • http://zzliuxue.com/upfile/file///rifatosigop.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160941fdc77b7b---15993041794.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/g6bf1h0vsajeikejf68enofks4/pogotiri.pdf
    • http://angelescare.com/userfiles/file/nuritagosudiwumujib.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/nimom.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f12c4565---ronomumojuwakinas.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af8c560e9e3---11895676685.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2gtce9d2o9pgm7e4s20c1u3i9u/rutet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 16792 bytes
font_01_sfnt_off00010748.bin
7ed76d453d51f8749f20e4b3f68e2128086f12c14ab5ad9da7f8cb0c60af296b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 2516 bytes
font_02_sfnt_off000111e5.bin
d01bbd3530edbcd2776914cbe67620f17e467533be88689d4e9b49b6fcda1d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 21788 bytes
font_03_sfnt_off000148b4.bin
6da2ff845fd560c1a9872c8922424defc53224529e6bbf07569e194d32889c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148B4 10544 bytes
font_04_sfnt_off0001609f.bin
ddcdc5388eacefd6804db0913045e7e6c5adccbc339517b5e54e6ca2d5c176ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1609F 17856 bytes

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