Malicious PDF — malware analysis report

Static analysis result for SHA-256 31abb54e5a414525…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 12:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a1ddb2dc4a40d410b2d39cf5be13d4a SHA-1: 645d047786652d3ee5b49f5e9e673ca30b0e12e0 SHA-256: 31abb54e5a41452530becc4d56d18af789f9e2e1bc75935b6fa4c75cd2e88c8f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm used for phishing or malware distribution. The PDF's structure and the presence of external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/6882fc1e38bcb41d734bd0a33fc20f89/59811223165.pdf In PDF document text
    • http://zdrowejaja.com/Upload/file/35385275709.pdfIn PDF document text
    • http://edelstahl-berlin.de/media/file/kunetipotasikos.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b71432b3fa1---fevaxizugotube.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/c91ns6gvq9r1ugotgggnfrkdr4/denukuporotemenavonig.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/fekurezijel.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/lerubemefeliv.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/39978575004.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/aec6a56cbe387ebe7633c3aac499ef84/nijonuz.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/54708456709.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16085586d8d2cd---puwajizozoxi.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5bb5aef73595a1ae241d2c574ac4d989/kokufotebun.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/82199884161.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec2545c0cd---16827213782.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9a3fpp2rli049ld56uvsaorfi2/65448917784.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/59000221286.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/27770090065.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/foweneboga.pdfIn PDF document text
    • https://actor-conseil.com/files/file/gizax.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a4f0c5d2b---takovosipuwezizejixon.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4e04a72cf449b8e08a0ffb711a0e037f/96445784080.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/0bafaa84c7d208647bc375022d938b6c/14576092866.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce48c8e15---52906129728.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b51df77bbdf7d304149fef91473a51ba/18855036337.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160caac1e095f7---66516049788.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/41424771752.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/87632082279.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/pugatokisadidij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=math+worksheets+for+grade+4+elapsed+timePDF link annotation
    • 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_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 11092 bytes
SHA-256: 7d2168480e0180f454e9f475a5c0257e98637ccb1889e024f499c7ae85fabcbe
font_01_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C6 16368 bytes
SHA-256: 7081d67dc49168f4dd5483745f6762cb02607dd78afd1be1871c6288da9c52ef