Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39b809e259959aa…

MALICIOUS

PDF

89.2 KB Created: 2021-07-01 14:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7450488d1c274a00847d0cb0aacd65f8 SHA-1: 0a4b4d79c2bf3984c373521951c2addadf5a256e SHA-256: c39b809e259959aa105d8943575cd550e7ae43763eb249707c71e49d00fba86b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

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 http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4fb9104bf---41757230728.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/rmh1jn8q73oiffqrtqjiac8k22/nosufaw.pdf
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/53745224991.pdf
    • http://www.puhito.hu/uploads/labovi.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c5d45a9f---zufejudazusiriverab.pdf
    • http://dgjinhak.kr/DATA/upload/files/202105271203165239.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/xevarabotexidupa.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/64581659267.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087edff4897a---muwevudasefow.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/74v0in1au7jot97t4sebv8d0f1/17455002805.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160703430170be---wepewanebinawi.pdf
    • http://vodnik48.ru/content/file/xasusiwedenogemutixesu.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f040a266---teragejaxiniladotuguke.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/tjahq7s36l8ku7ssj156d132rf/96317196519.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/918f7251be5cbd978693a6ed1b280b78/51443918079.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c26dcd88e5d---19034624167.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870d61ea5fc---41200757625.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a09d9468e56330fda849699cd843c0d3/65541053579.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/enue0e2i6bilrar32fgi6hcbi3/rapikilefoparijefixi.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xulotasesadiwe.pdf
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/bipukafuparifebakite.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d814e0513---47259093442.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8770d28f3---76474010015.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/19e79ce1b1ef2a78631a309753395392/29927986815.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e62f0713ecdf56d117d40b73a7875322/figarodatesajokivovivaxes.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dhal+recipe+green+lentils
    • 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_off0000fbce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 16792 bytes
font_01_sfnt_off000113e5.bin
074825f5c126c13e35dc2f1761d0637c12289a374d3fbab65de82342d13d2faf
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E5 10532 bytes
font_02_sfnt_off00012bd5.bin
bff1b46eb1031cfba14bddf8142bd612bd252ef8ee3533ddf5941c2f3be67b8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 16916 bytes