Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1562a040867655…

MALICIOUS

PDF

101.8 KB Created: 2021-07-28 04:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 317f2c347e0ee668db19203bc3e3b3a7 SHA-1: 3efc08d03a7c853b519403645d1475128bb305ed SHA-256: 1b1562a040867655ac152948966cb07b5ae43128d6603cbfb3b4efe72a28622c
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The malformed stream length heuristic further supports the presence of exploit code within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9516

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/04bce46d482e06edf517a768ba9a7772/zigagagokozatu.pdf In PDF document text
    • http://vizcsap.hu/files/file/92558871691.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2428581a57---kelogovipozalo.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/77851338031.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/zapekovujivukopategorama.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099af0c095af---44101011188.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/5d8qhqt7n7sbb78vk90reva2df/44142040034.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/nudabofutevewobaje.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210617235647953499wbwxo.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/86d318ea57e0585f1348b18f1fa68292/66892947973.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/wezivurusabom.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/bbcd3d69c2ccad9826c1ebe3219b0879/50271046877.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59e1d547ff---dukirulubulo.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/11940720646.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607b661748ed6---nefiwujuteragajukiv.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/sjrgma2vthh2jedh79i133hb14/pugulasumamononapevojoxub.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/monavedug.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/37212885482.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1st75dtq8ut77fj3p5ob7jp7rn/62108952093.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/giquhg0nv6uqauql7pe9nngqjj/jinijifikadimiwiji.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8ea94b485---sapotenekomujamumakugozew.pdfIn PDF document text
    • http://svx.su/ffile/file/90686005587.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/0b70f108098dd439b65d0b3f6e888261/wosozuxuz.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/tirivegina.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca31108f537---27318100652.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/11202585040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=scarlet+heart+korean+drama+ep+1+eng+subPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001339e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339E 11328 bytes
SHA-256: 65a2d9c0cbdeed8c2d8646283fa50756782b1ef920178f1d125daab462b9aebf
font_02_sfnt_off00014db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB5 18008 bytes
SHA-256: ce4ad9022e43679a2706b49728bcac7f5feb00c71f0b8c0d22b2864891ad195f
font_03_sfnt_off00017d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D05 1864 bytes
SHA-256: 92041ce0e2a09f9d2710f2d3db6649715d551c867ca6de233766093cb283d229

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