Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c4fa6703dd2079…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 06:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a9970ebdd0db6b3949f657f4039d54cb SHA-1: 369dee232045fd1be02d7456f95f8476f9972eb1 SHA-256: 22c4fa6703dd2079a774d1014bd76f9449a269339de94a5a0dd16f9a2854e275
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains a phishing or trojan payload. The document contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF-specific heuristics further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://brickbodysupplements.com/newerac2c/userfiles/file/zolodowizoz.pdf In PDF document text
    • http://pn-tech.net/userData/board/file/48729411864.pdfIn PDF document text
    • http://hopsch.de/uploads/file/wezefo.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/66906c078e107bf42325695ce89e56da/gupetezosoxegipukufef.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/vivobomorebavo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f436536dda---80137447892.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160770268335ee---wutudakevapalomatozum.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e68b3b635b---68925050016.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb60d0dafe---80670682953.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989a352e449---fezapup.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5201ccf316---59113066115.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a53e28012f9---semukawineduk.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/33891879753.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1b1b0985f---94829255748.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c277c7409c3682618bd0fef9d39d5335/lotubuzejegepidutejuluf.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/864babc12097f595fc0c47b2b87206f5/xalavawugilujebadazi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91fcbb0a5b---refevanimupaniz.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/80235279303.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b082ed4ce16---44925519512.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/maronabavajavuderog.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/4cc2f824bd517baa0dccedb7b5ae3347/12261325713.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/94684401989.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/pojelobedatinosarote.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d33b5148bcaba16c60ab0bfcd84b9a89/safobuvusu.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/51333189816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=conners+3+parent+rating+scalePDF 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_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 10752 bytes
SHA-256: 7e7256c0f0fbbc4a05b61877f88233d921ee569157698262503d10f60f98573b
font_01_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 18144 bytes
SHA-256: 3f5fb747557869823127ed826515e512a17b348af085ce88cd9edc546a494b53
font_02_sfnt_off0001336d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1