Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcfc81854f52eae…

MALICIOUS

PDF

70.3 KB Created: 2021-10-10 11:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e1a97576faf8b75a2fcf9b9e4e1261fb SHA-1: 5660cd19e8221dc3b38c0d280de4467c0dbbc406 SHA-256: afcfc81854f52eae4275097fe65684124672d382f807a43675671deaaae3d631
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The PDF's structure and the nature of the embedded links strongly indicate an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.2381

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=fame+meaning+in+english PDF link annotation
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/96828430276.pdfIn PDF document text
    • http://yejida.com/userfiles/file/15221321185.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/nutexesemimi.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/tapikep.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/24305766924.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/lituguwiga.pdfIn PDF document text
    • http://ruihuitax.com/files/file/59235963652.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/42883713045.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/133392c07162267bec6ef76b609c0835/mipepowokirenixip.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/1565994089.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/robesatupetesa.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20211007021816627.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479e6d720ad---32185984340.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/61644626885.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315063b9c26---82104564970.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/dutevi.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/63253222987.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/50848425680.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/mofebupejuburezijagow.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/zikalep.pdfIn PDF document text
    • http://pasted-radio.de/web/files/78599259820.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/winokowozepazolidad.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/30672705667.pdfIn PDF document text
    • https://membermimpi.com/contents/files/33420160802.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/877314060.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/guvizis.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/kugawijekanixosapem.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 10216 bytes
SHA-256: 205606ba6347752b6b02782ad9c6ecc6d1c3f039c82d3eedbf7f56c4f1cf1088
font_01_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1