Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6a9ae4cb7a5dc1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 12:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85d016456fa718d0721aa121c9fd14d6 SHA-1: c45ba6588d9737231ddfd4b9eb0046fe0c9cd423 SHA-256: 4e6a9ae4cb7a5dc1c1d3cabba9cd3e84e5bfcd4c18f27a1c2c25fc11626fb024
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://amindoost.ir/images/upload/files/lodoxigejokupali.pdf In PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/33412297524.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/34562995258.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/koxigiralodepurojukisak.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/lowunujazejisudaraxenu.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/32683301241.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/wobexupidalunagujubazopej.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16137743e42c11---xapopitigimofajer.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/difirinazuxosowu.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/71109668002.pdfIn PDF document text
    • https://sapporopools.com/contents/files/gikafa.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ef47c75129b299bc0b8873ad8cf4e997/lidotewufep.pdfIn PDF document text
    • http://turatabor.hu/media/daxezijevaxazebibo.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/tamaxupumabewoke.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/11387113682.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/rufafebuvejavumoz.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/91131723373.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/fawij.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/muvoxe.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/gefejobexusamok.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/sarovuwinatisuguviketudit.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/58sdbar6d1hgcikqc2atealc01/76046136500.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/19729536426.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/kalazigexunuku.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/15153367052.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/bisinid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=meeting+you+ep+1+eng+subPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 10516 bytes
SHA-256: 63461508ed3ecfb001adecb2bb158df0b138c72f6811a8ad0e4129d827a7dad9
font_03_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 19240 bytes
SHA-256: 5651998ee6ab76e6569816bf81235787d62b53b2dc44e314013c009d102b92f8

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