Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78ac0182c6aa3d7…

MALICIOUS

PDF

77.6 KB Created: 2021-09-10 08:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97079688140ed9b263c614aba07a5e52 SHA-1: 127498ffb066c5549f226ed37f0b5f7b02201a8b SHA-256: f78ac0182c6aa3d770099a8c1b2ef0002bc39246522885f87fe9e2633ce576d9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS upload directories. The presence of multiple external links and the detection of a phishing trojan suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://loffoxfitness.mvwebsolution.com/userfiles/files/totefedupafe.pdf In PDF document text
    • http://zekidilektekstil.com/images_upload/files/numitukutudilavinigopuxi.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/mipigegofesomak.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210905182300.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd4b24005---23730004770.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131be717796c---9003235912.pdfIn PDF document text
    • http://belovosushi.ru/files/87355469420.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/59397072678.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/movowimudijuperijaku.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/xodewokokimil.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/69866868029.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/dukemaziludofeg.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/kuxavujibixejime.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/ripexavo.pdfIn PDF document text
    • http://coffee33.ru/archive/file/76857881489.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/49720430577.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/10009040554.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/78831720700.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/69498292131.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/zugezaxatiwulibowifufore.pdfIn PDF document text
    • https://eventaipei.com/upload/files/fesalinokegapowusivupowi.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/96548911380.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/zevamipebe.pdfIn PDF document text
    • https://finliz.lt/i/File/vejitolizolabaseje.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/cp7kr2q6ffsca95oo4m4d8tqs8/7438467081.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/13003813697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=iggle+pop+androidPDF 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_off0000c532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 10252 bytes
SHA-256: c52d0884c1f51d21e3ec9ec049eef2c905a2cfc4f68e7486ef2d96dc0fa3c8e3
font_02_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 20040 bytes
SHA-256: d8695d9bd4effb0cb5190cf8b80db169fca4e21b1e1f4b970660532e24f0c9fc