Malicious PDF — malware analysis report

Static analysis result for SHA-256 b258db7b088f2eac…

MALICIOUS

PDF

124.9 KB Created: 2021-06-29 12:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30d68f0d12717e7571b695e9002c097c SHA-1: e70cbd254d7dad6b4dd5b6ac142e4682b093c5d8 SHA-256: b258db7b088f2eac8bb7556819af6d1f72ccc52a01e6e8e533ca8cf176ecec86
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088447da3710---nefagugimekekuwopi.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1615663bee---17511537558.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609894064d97b---mikaxexotanofoj.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/60308498427.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/17525f6f43c6a929b46bb092e7cb056e/92563347234.pdf
    • http://jandenzobv.com/image_uploads/file/dadogojibefevefil.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0345e8155d---57889816589.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86c813041---devaritozojadi.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607379918513b---28382223690.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8deba51bdfb0c844042e53468af990df/wenatizegu.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/5a9293bc97671d9e3d9c7222a4895375/40351056939.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/4306a2c622cd42a90435b8e3cc2742b8/dusunorasa.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eaeb33cf0---10710611123.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807dbc23d7b---bajufijegivexivojo.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb3569312---sisurerujopufuzopej.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/483aab88488a04aa55243bc4e1883605/jatiwovubaximopax.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/dd406f817395dec0af4051c81ad2d16f/wemol.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20216111212509285.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6d4d1b15eb1dc26d2f269b0d5f5d4bc4/93863188802.pdf
    • http://vogiantinhmach.com/media/ftp/file/sunomefe.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160aada34ac973---wezariwidogoxipu.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/95bdm0ct51nt1igdbva2el1fbp/24497822980.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=data+structures+and+algorithms+in+python+solutions+manual+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_off000181c3.bin
adef4861334018c1a41dd6b476ae0d5209648c09f9c90fa31abc38ff1129891a
pdf-font-stream PDF embedded font (sfnt) at offset 0x181C3 11280 bytes
font_01_sfnt_off00019be2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19BE2 16792 bytes
font_02_sfnt_off0001b3f4.bin
f491178de6cca48ddfde512e17d90cb25fb783f512c2771a1623447797194ca8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3F4 18084 bytes