Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad88cbd49867c82…

MALICIOUS

PDF

102.0 KB Created: 2021-08-12 12:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 58d8efbd11aedb5da69780eedf70a4b3 SHA-1: bba501cb1893afa03860b5caf3805fb4030a86b5 SHA-256: fad88cbd49867c82171125d2c3595dded17be205046f58137a1b02668030b612
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. The primary purpose appears to be redirecting users to potentially malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://abofahed.com/userfiles/file/navujotupukesawez.pdf In PDF document text
    • https://aspaeng.com/files/image/files/37060416109.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8d9448b0320c4e5ea99c781848b01a2c/89207827672.pdfIn PDF document text
    • http://mav-auto.ru/images/file/tiladavepozerinujaxa.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/garemalawodoganajavisazu.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/4masln58iivd478svvqc5r7f8g/8450801624.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/25842988801.pdfIn PDF document text
    • http://skupka23.ru/upload/m/65461208368.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/97477742110.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/31q3493kr341hpvgeg1utjc05b/kawuwefakurafik.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/92823eb2fbafd77fc1a48908fc92f284/wovutodinar.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/xarisu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/uqvs9unb5q3ee3i6jd9pn7gs35/foraxeniga.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/gipapizopabugabetovo.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/m2shufuku6uckq2pfs60j5pc64/vexuni.pdfIn PDF document text
    • http://plncse.hu/php_data/file/16699754932.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/13047272267.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210708/file/16257468025042.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/jolakirezatuvov.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/15038400075.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/21329817697.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/75328736162.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c201d82ddcb---14057838463.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/82139759324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=domain+name+availabilityPDF link annotation
    • 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_off00012cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000144c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C8 10324 bytes
SHA-256: 21ffc5a2a1d3b39dc91b854809263efb3689c860a37b8823a4a2330d8f62b138
font_02_sfnt_off00015c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C02 17456 bytes
SHA-256: ab772c3ceec1b6b08ec2cae467a7a7fa498e4cbc66aff147f886e9edb3b720af