Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1f5b7013831bd1…

MALICIOUS

PDF

91.1 KB Created: 2021-07-03 20:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45b03395fa5e27755e007576ce4ea9f4 SHA-1: c049f791c9edc36f5347fa2d913c0be7a22bb5b8 SHA-256: 6f1f5b7013831bd1ff1c88b87417db98d7920090c0fc6330c171e4a8ee967726
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several URLs point to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The presence of embedded fonts and the PDF structure, combined with the link farm behavior, indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coonvalleycc.com/userfiles/file/wotedozalaloputibam.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e16b5d1c86---tesubi.pdf
    • http://www.awakohchang.com/image/upload/File/7819933193.pdf
    • https://llsindia.in/FCKeditor/file/95424404214.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d00ab09667d---nogigalatekikumepub.pdf
    • http://sahamit.net/userfiles/file/najitutadizaludokul.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a114002598---keduxobexivusuvan.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d50b1c89ef4---lulezonozowanox.pdf
    • http://thesecurityguardunion.ca/userfiles/files/niwat.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/l22mpsnh5l5psrcksfmtp6r5li/jasukaxavofibuwizoguri.pdf
    • http://www.deewanalarab.com/up_imgs/torojegifufawusar.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ogovn2vfec0a38ilmc249ho9m6/kagemomuv.pdf
    • http://nicenpos.com/userData/board/file/xasalu.pdf
    • http://www.bandungmesin.com/file/zuzunujul.pdf
    • http://www.europesolidaire.eu/userfiles/files/jenaduxinidisesanodar.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/a54fd9010b749da661d619c41a5875ce/sebowofomomeket.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/0da12f70ebf99473fcff2a2698be59c2/31121430505.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1fa4894c73e04eac2ab57956e02b55dc/26593108733.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ca134f79---68438380195.pdf
    • http://jyotiacademicpress.org/uploads/file/zeluduxowuxevuluwomaxa.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c47d7ead4---dazigenulepovo.pdf
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/dosototogozafozitafag.pdf
    • http://cocoal.com/uploads/file/62923916103.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ring+3+instructions
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4919bdb73fe94d0f2b7df5ac773e9171/xurisifawaposo.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_off000104dc.bin
b68b8a5cc77dd7dda5a7fec3b0d515d6149375be3d0726cafa3ca69110fcd10b
pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 10380 bytes
font_01_sfnt_off00011c8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 16792 bytes
font_02_sfnt_off0001349f.bin
24192ba0ca12b4cf3c1fa13a0eeace25e27fef7a7ee50c9522f6d18fbb20d6f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 16640 bytes