Malicious PDF — malware analysis report

Static analysis result for SHA-256 569abe62bd26f9c2…

MALICIOUS

PDF

84.1 KB Created: 2021-08-23 14:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 879463310f24b1700acea90a1fa48905 SHA-1: 9a40bfc381ed75be416f99a9e7947a6ca0b4640d SHA-256: 569abe62bd26f9c2a89f16ec7f7af1ffc9772991f3569afe998bea3b2b32024c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://neboskreb-irk.ru/uploads/userfiles/files/99095174286.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f5e076dd1---kawerilubabubajidog.pdf
    • https://sce.tw/uploads/files/60ba104183986.pdf
    • http://www.deco-interieure.com/userfiles/file/35319473073.pdf
    • http://morgancountyoh.com/userimages/14570482515.pdf
    • http://ledins.lv/cms/file/44251504654.pdf
    • https://n-zvuk.ru/upload/file/rarezi.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090e25c0074b---xadovenevumelejavu.pdf
    • https://corpusbg.com/files/fck/file/lezazavokumabivavirawirik.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/882ccb5bdf0e5b38fdce9f58e8186252/xeneluxukabu.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8d450c8c151feb96c1a185a1f43fb32e/14549333148.pdf
    • http://annamsaigonlaw.com/upload/files/pugaziviwolog.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a3e8aab60f8d2d2e729e227ea2d668ab/71655698768.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/34eb3a7a12d629ba666bb2848d0f1ea5/46188038227.pdf
    • https://larustt.com/upload/ckfinder/files/wawufedimukovapiret.pdf
    • http://normel.org/files/upload/file/62644194380.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/xibuzadivisowixe.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/28246601067.pdf
    • https://akapacha.com/userfiles/file/zubekozenuzi.pdf
    • http://haumeaonline.com/userfiles/file/gefolopaxinorisenab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mom%27s+day+out+programs+near+me
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 16792 bytes
font_01_sfnt_off0000fe50.bin
f86565b43a99a814e80042b774ecc90e86ec619007714b3ac60da43cc2135af1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 16708 bytes
font_02_sfnt_off0001297c.bin
fd17b2937cc7ad1b05ab739075a908d99e8cde8296a2827c9728075684c14cd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1297C 10836 bytes