Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f77192f31a17a9…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 04:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a4e3067e7b12df77e47bb49f47cae911 SHA-1: 70b36bf2f1e10ce224b8f832fe2fe6c77b72d523 SHA-256: 61f77192f31a17a901571be9087a0a212e9b577947c55e0dcf39f108c3fc877d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=audible+mod+apk+download PDF link annotation
    • https://mk-promotions.com/ckfinder/userfiles/files/54255138170.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/86673599303.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/badukonoxidivimegijas.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/86083755111.pdfIn PDF document text
    • http://wdnederland.nl/file/72167842152.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/48738564899.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/39989237489.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/15455587125.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/tisuw.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/99216842318.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/03d4b15be88fadbb3ff48299de62178b/tadata.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613945acaaa4a---27338099981.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/94b5e9ef209fc6eb27552606ee097c68/jepimikusukaxazexapafa.pdfIn PDF document text
    • http://gaudi.tw/upload/files/wejemavoj.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/sivowogidunusumekiwipa.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/80603724491.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/bivukuzuwon.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/dofozemolenize.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/20068183484.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/xulutolabulasibilo.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/11877450198.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/76463488864.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_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 17744 bytes
SHA-256: 26ffa8292da184b4fc213ac65acf3402a9551672efa17dd2876af55816166647
font_01_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 10588 bytes
SHA-256: bd34466199980a5a0ad7f39f1ef8fd143c5a721f1f3bb31a5a4c482aba9c5837
font_02_sfnt_off00011d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1