Malicious PDF — malware analysis report

Static analysis result for SHA-256 6559af42278a38c8…

MALICIOUS

PDF

101.1 KB Created: 2021-08-15 10:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6acbf32b6e6c90265b899f1f055b698d SHA-1: a838d2bf4fd6c3cb00942ddbbc0a9f60c2051e17 SHA-256: 6559af42278a38c82a4a1b915d185048f8e0d6e570af923bb96239299fc5cbc7
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the 'link farm' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://lex.tj/img/file/vovaburokef.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16077e20f11154---mojexoruposofawurakikoxi.pdf
    • http://microcement.ua/userfiles/file/vuvuxisametin.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a8aded75---mekiwibagaxavekejo.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c43cbe5735---49895419123.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b276db7faa---60984472010.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e203609cc85---vakogedegugorutu.pdf
    • https://abofahed.com/userfiles/file/82630046422.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8b38f6f6cb772ef6db1a5b74a0e397db/gazivinokatu.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df94915a1aa---vurikiberotuxuxubaguka.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ae1dd335---wazudapi.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16110d24d4a381---guwixixopirapejisutaru.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7424ada616---83355093744.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16084832e363c0---sotisebowevato.pdf
    • http://for284.org/clients/7/74/7452b259410349f427184d5eaa48bde7/File/23958948976.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/gizaj.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a657285c9923583d23ad191a9cec0a5c/90909510393.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/de5hhceoele950i6ddjn4co4gj/varesokekolujanik.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730f9f8f39b---fizigex.pdf
    • http://j-club.eu/userfiles/file/35350357997.pdf
    • http://ropesadventure.com/d/files/tikike.pdf
    • http://mobilesamara.com/img/files/file/muvuwuxazafiniw.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160865474574ea---panone.pdf
    • http://ubest.ru/images/file/jitegivekeji.pdf
    • https://hijaulumut.com/contents//files/bolekadoxuxeketitita.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=importance+of+observation+in+research+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127c9.bin
3ed6358c24b365a1cb8d6c6e6ae1c8dcca16bf5cbb5cd32b81ce0f8c41186760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127C9 10996 bytes
font_01_sfnt_off000140ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140EC 16792 bytes
font_02_sfnt_off000158fe.bin
7cf5e20fe0d1c408fc79e445545d07dcd4f3aae4f08f518abb150c029094bbcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158FE 17564 bytes

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