Malicious PDF — malware analysis report

Static analysis result for SHA-256 42914d02421c595b…

MALICIOUS

PDF

86.0 KB Created: 2021-09-04 17:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 598fccfd294ad050515b385161610e3b SHA-1: 8c3fe0d8e4d1b57fb2ef6c0257217128b59f092b SHA-256: 42914d02421c595bc260c708cc4be77aa34c8348f0e8c3da4cf1be752890a06a
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to compromised WordPress sites or raw IP addresses, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/1c059aca6dcac36dcd84c091c8e77e7b/23624186000.pdf In PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/mu20l641e9nicrc55ck485codd/29562386897.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/cb73b2386ffc9ad3a411cabd41eefdd5/73777943726.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/298b3cae4a66a82fa3eb993760d714cb/26359943885.pdfIn PDF document text
    • http://kesifveotesi.com/files/19740455713.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/91645759855.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/cd649afbeb83d088f93fb6b29e522dbc/doredewitumegopafut.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d012e115d98---38367177908.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d1d9db93d---rudijulakelegisag.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/16879515008.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/satezifulilijabomimi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zigewuri.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/nemimanupuwisokis.pdfIn PDF document text
    • https://tcremich.lu/files/files/51292308367.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/21928146184.pdfPDF link annotation
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/l5dabbgfgdfbdfr4o60vg1mn2n/26238692411.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/fatibi.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/73018474761.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16246637234405.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/geu0c52h7i3qdhte8u42e50rp9/sevosiwoguki.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f8f22e5e8867a4919a5c9e088f14279b/84215397480.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///24453590079.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/dijaroduniwosikitutipak.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/novesapezuz.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3f925e0da34c91d4574a9417e05dd071/gakelelujijonirojivapov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=flexitallic+gaskets+pdfPDF 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_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 10644 bytes
SHA-256: 2c89e64025f9aa4137369209629d7e63b7796b0e20df7d9fe366923beda7c754
font_01_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 21808 bytes
SHA-256: ba86e1b97aab5780eedc6ed39bc2d62b7cea1c1e475c658f2105f77f3ef97ad3
font_02_sfnt_off00013246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1