Malicious PDF — malware analysis report

Static analysis result for SHA-256 dceb67b5605450ab…

MALICIOUS

PDF

94.8 KB Created: 2021-09-10 22:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 536d8d8efbb9e7489469ebe435e2c896 SHA-1: 9320d615c7daa01cf459e2f5b756c73f5fdf53ed SHA-256: dceb67b5605450abbf5e96c55ec3c20d0f37662c2bc08efde1cb3bbbedeac19b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are intended to redirect users, likely to phishing sites or for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://medvor.ru/uplcv?utm_term=android+app+repositories PDF link annotation
    • https://coolinterier.sk/upload/files/bifekokaletikika.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/dunabatajoroxom.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132588b071a8---kafadirujutupuleb.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/wisagetobovixijorap.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210901142143.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/teferexapawaluv.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/jetif.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/punoterudalusubowa.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/lomibowimo.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/wivoxedisenekiberuvesul.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/36211229918.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/22159225428.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/wupasunego.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109022350533335018pds49.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea4518029---38587379488.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/sq8kpme8hr773afvpt6altbial/66989843473.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/43855da5dcdbfcbc003ea1afaa9d4e06/73414523758.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/rikometinebaniguposimoto.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/kubatutipezu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161301bb80a48f---55234962750.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/dunamagoforinod.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210905_103854.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/bf51574ff3ad9d4c6d716c54714424e0/xojasuzazodakadovi.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/86575308271.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/13965262970.pdfIn PDF document text
    • https://lapdonline.org/file/14599476393.pdfIn PDF document text
    • 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_off00010e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 10320 bytes
SHA-256: b4d70c6a0b9ad75a21795dc163381ddbb89fbd893440028f4b971b1797da1ad2
font_01_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 18116 bytes
SHA-256: bf12fd8d2ff92deaeec202a05725af00fae358ef49be1152853ea99856f569dd
font_02_sfnt_off000154f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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