Malicious PDF — malware analysis report

Static analysis result for SHA-256 c115048cebdddd93…

MALICIOUS

PDF

86.1 KB Created: 2021-07-05 06:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19c364ba4ea88c274e67d8031f45a10d SHA-1: 0752e3205877dd25325547e415f53a0462a93988 SHA-256: c115048cebdddd9393492bd3b769e5750c92bd48846178b28ec51129e200b334
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://speculatio.in/ci/userfiles/files/75998269648.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45fa07197c---95815006393.pdf
    • http://studiotecnicobonoli.com/userfiles/files/61199548689.pdf
    • http://atek-ent.com/upload/file/kositodaxamon.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/e03060456120881478facbf80d34f65f/xateziwez.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b1cdfe1ed8ab3b5d4f9ba1f9518ab188/18265701911.pdf
    • http://maxidmum.com/images/upload/fck/file/89866975858.pdf
    • https://maxflowfans.com/userfiles/file/76194643062.pdf
    • https://askisan.com/upload/ckfinder/files/sibemuramamaguwose.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c268b4c4716---8521620772.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/5gg7ccg1uv1oq6j602fhfbdvlb/lejinuraj.pdf
    • https://tectrongim.com/uploads/files/pisanekiditizem.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78ffce3f3f---vasiz.pdf
    • https://agrimal.pl/userfiles/file/64696945745.pdf
    • https://fotojursa.cz/userfiles/file/bipexazetomeviravudotugaj.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b116b202998---loporubibekot.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/idne58nkp896bpvb2kqv8s2r0e/davobewubap.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d503cd8eb---nupazu.pdf
    • http://www.jindatunnel.com/up_files/file/kizesenafati.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce5e62ec1---94823622488.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/49tnscmtndibrromq7vv1rrkih/setususepuvezijif.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/fajokakekijenodow.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b385651f1---disibaxovor.pdf
    • http://somsit.com/ckfinder/userfiles/files/metagigiditerur.pdf
    • http://katyababash.com/images/uploads/file/21282017113.pdf
    • http://deforma.it/userfiles/files/mesudukerekinet.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=wpa+wps+tester+apk+old+version
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d676.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 16792 bytes
font_01_sfnt_off0000ee8d.bin
3efccdedd5a35724b8b91a91c55130424285bdcaab30049a0101d446e1701743
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 10620 bytes
font_02_sfnt_off000106ff.bin
3cd6d031a8e164e13446a09f265b108ad177ebfbc94d0504e9465a3e96497288
pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 17572 bytes
font_03_sfnt_off00013422.bin
6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 16384 bytes