Malicious PDF — malware analysis report

Static analysis result for SHA-256 0331550fca573f29…

MALICIOUS

PDF

71.4 KB Created: 2021-09-09 10:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70f5e3e2c6608a8085fce324deeeef86 SHA-1: 9e8e59d61686f09c9b160e9a06b63fcda8c11dbf SHA-256: 0331550fca573f29daa91ccd1401ff7788b62e416f980d990c3dd0f35122c5d2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristic analysis indicates it contains links to potentially compromised WordPress upload storage and a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The presence of multiple external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hantechwelding.com/userfiles/file/2021090521460573499.pdf In PDF document text
    • http://nilesk.com/userfiles/file/42890890128.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905041153295.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161304af02fcf0---42956741625.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/69403148670.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/mibojalobibelixiju.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/23548790628.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/jepotolozifo.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/xizuru.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/12289008061.pdfIn PDF document text
    • https://medpressa.ru/files/file/79258742240.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/f2cdbcf1922fd6a59b852790b2531491/61263471828.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/wemadiluje.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/nesofukogeferakawoxek.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343de60253f---771888908.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/zebibagemewisav.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/en7lle9u953ufabdagkb39g9c7/ninasenafalovidaregalit.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210909054915.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/67125411801.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/71138495454.pdfIn PDF document text
    • http://retailcop.ca/files/renejapejubovazatu.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/2192331341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+do+you+update+your+play+storePDF 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_off0000b6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB5 16276 bytes
SHA-256: 580c80d0fcc5b12a35b1d94527a5141e0382336df3a38c8d585fdf3aa62770ef
font_02_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 10480 bytes
SHA-256: 9e7467493081698bc1495497dae8f829870d3a775259586786978e93e634994e

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