Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff608492cf5ccc3…

MALICIOUS

PDF

92.8 KB Created: 2021-07-26 06:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 33c82463d4ccfbb5116b4e05c1d0fd69 SHA-1: 2ba90d846ec341eb5a8ce5b1212868902e393560 SHA-256: fff608492cf5ccc3033ea6b009532adebb17b341d845ca3072c65f211b8d2053
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability to execute code. The file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms strongly suggests an attempt to redirect the user to malicious content.

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 https://advantagelic.com/singhania/downloads/file/sikebanugifojowa.pdf In PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210630/file/16250693911739.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/27552374209.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160baca90621b4---zobevimesosafaxemi.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/8e3c4febcd10d54418aeaac84aa02ac0/vozevedusudovelafudugolir.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/5f21c7da07e9946178eb978d90b99db8/35357551316.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/87301943814.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/geseg.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/loxutozili.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fdca772e9---82983797030.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/dibeter.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/94594115859.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/dawupoluzogetuzezu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b291ba70a---momaxorasuri.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/xomefufifowebawulefide.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/cb0b031a1e3a5b746b3a6bd9c220b149/vudadifepesulubafe.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/kabenirifisamuvuxune.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/sakab.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786690a23f2---23411589172.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d4e2712c---liwujinifa.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/53427485528.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/61102519531.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/gowijibivozironofulinop.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/60872717442.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/pefomafib.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c98983b463---wogenopevulogazudogefede.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/2462612341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=aviva+life+insurance+plus+application+formPDF 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_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 17452 bytes
SHA-256: 573cc8c8eb35aac14ba25a368313f9fd9ad1ce4016463730e39c00edfc14cfa2
font_01_sfnt_off00013381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B98 10788 bytes
SHA-256: e0662ae03714feadcf67613c773222e022f77c6439d02146ff960218f53a1e33

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