Malicious PDF — malware analysis report

Static analysis result for SHA-256 12db0a038da6f397…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 10:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c35addbb952c2f49020fbf0b96149247 SHA-1: 2163cec0a0ad58929391b422e9a8f4c0040fd4c9 SHA-256: 12db0a038da6f397fc615ebebfb79cf4d3e36f18a69e47c2abf36a5617e6a7f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS upload storage, which is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of a link farm and compromised hosting points to a malicious URL redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=how+to+send+large+video+files+from+android+to+pc PDF link annotation
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4ded409c---vudemafifafozel.pdfIn PDF document text
    • http://cycling-software.com/files/file/95708529688.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/dapovax.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/23680019408.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210908055417.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/48788516254.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/80672221907.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/29411946977.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/gaxakopotikofenosatefoxev.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210907160420.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/99000251266.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161424c85d02bc---24214331354.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/wugixoxazeko.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612faaebe39a7---24699908216.pdfIn PDF document text
    • http://youil.org/userData/board/file/67939944203.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/zakonedovu.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/tidupiwamez.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/85269524792.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/8035320794.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-14/20210914143217295719.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161390d813b183---gufaz.pdfIn PDF document text
    • https://terracell.info/images/file/zulapuwi.pdfIn PDF document text
    • http://partnercable.hu/files/27325120711.pdfIn PDF document text
    • https://renewone.de/files/lugajogajumukawigame.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_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 17876 bytes
SHA-256: 4e07d1d494fa75b14cde2200ea4c4bc84efb95c9cba7b4d579d112769b7a2e3e
font_01_sfnt_off00010b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12351 11108 bytes
SHA-256: c60731e7efcdd022e21754a3456ef96a6efff75e104f7b5b6e9a80649c85de1f