Malicious PDF — malware analysis report

Static analysis result for SHA-256 581ff7233ac86082…

MALICIOUS

PDF

92.7 KB Created: 2021-08-16 21:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5f8f318022aa84410693edd7247b2c18 SHA-1: 68b29217ab02d11fd1d3823653f22d78be29a931 SHA-256: 581ff7233ac860821fca870c532e5c2917f6574665e75c8cf058fa1ae22bffb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://garglob.ru/uplcv?utm_term=how+to+look+up+serial+numbers+on+money PDF link annotation
    • http://rentaruedas.com/files/others/77235911457.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/somonujugugugitokufofo.pdfIn PDF document text
    • http://web68s.com/upload/files/26806469312.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c8587ca26f89ec27e0932bb40cf4efa4/73972652445.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608045a99cba2---nasukerulola.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f89b12245e3---86898621768.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba707c44b16---degenazejetilawolamod.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210707_815047DB151BE01B.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210722_3332EC00D28208AC.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0435c8dadb512413dbf888cfc320c656/xokukuviwenapezuxazegi.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/regemu.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/fidazilifusufisopavezonu.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/fifukurazapejulusu.pdfIn PDF document text
    • http://domosplast.hu/files/file/70823531744.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/eafe370b9c7cf69c56479ad7c837f801/zizurori.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/tatufunamukerojewevif.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/2030bf12be228f0b494531e8e9f13c65/84621262701.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/69797237575.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/gawupudokup.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddc248e710---sovif.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/nusaguxetin.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/45003960167.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/88510709533.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7644677374.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608271a30e23c---juloxawakajo.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_off00010635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 10936 bytes
SHA-256: 9d23765ec89b052496d2324d0060dfb354c402f1f45441fb115f11387683c0ce
font_02_sfnt_off00013770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13770 17224 bytes
SHA-256: ed54aa5b5f70d5782a5935926e390983d474192a1650908394709b0c429928bc

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