Malicious PDF — malware analysis report

Static analysis result for SHA-256 54194d7614818fbb…

MALICIOUS

PDF

95.7 KB Created: 2021-09-13 22:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0f338e458ef3ac192fcdc80808d9d3e1 SHA-1: 3f3d02894120f1c3c8eb56bcf05a4cceeb090986 SHA-256: 54194d7614818fbbe86910efb48397ba48a239baf6adcb8aea121075a4e788c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to potentially compromised websites. The PDF structure and embedded URLs suggest an attempt to redirect users to external resources, which is a common tactic for phishing or malware delivery. No scripts were extracted, but the PDF's nature strongly implies it's part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://shipagents.nl/uploadfiles/file/novojizuzijotijubixizala.pdf In PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/supikab.pdfIn PDF document text
    • http://fohow77.ru/upload/file/futewulexo.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/muxodukifipeda.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/91c7a25e96e2201d8b4a5b7a001c47a2.pdfIn PDF document text
    • http://nktrading.qa/file/files/pujibaduwitapuke.pdfIn PDF document text
    • http://coumert.com/images/file/47333015280.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/72590282502.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/tfsodeorn4a53hvotagm298594/75866335022.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/88023623115.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/gijologuvenifujokuk.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/8613625156132a1860f6e6.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-07-00-56-09-66.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/riwimunutiwididokedo.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/sonewutufum.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/vegurixiwetat.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613623ce49e9f---88717226529.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383d8a01fc3---weropurakiv.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/xakotupinazibodefulexomon.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/86087858973.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/51544143306.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/21306370255.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/xugejun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rolling+stone+greatest+metal+albumsPDF 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_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 10736 bytes
SHA-256: 1aad0610185fbfa8dd8ae1814d37a62c9b1206e1de09e571daf3e42a5e350967
font_01_sfnt_off00012aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEC 17772 bytes
SHA-256: 5f189870f75dfe73438cbabcbdf9d067d97db6448d71c3ff6fcffa27034b33e7
font_02_sfnt_off00015910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1