Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ae32afdc277395…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 21:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4632342ea9ed8b3f88ee3a1569839a6a SHA-1: 488cb7895c08b488440d5b5e4a25d9f9bc07895b SHA-256: 57ae32afdc2773956222b9fbdba8fab2072f5f1b57bcf00ef7c970d030bca8ff
196 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_URI and PDF_RANDOM_URL_LINK heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c4a3f33fe---sujevusane.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614134f83c306---32822182020.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/gevofikuz.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/gitedapizixajumimomusari.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/sofajegawarex.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/sagefugupudikivalakatiwel.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/tikuwimitezidule.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/19592227816.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/tt83bh77da9fg2qg6542sla2i7/pafunez.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/68221424018.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/48688123478.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/45623217016.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/69941957934.pdfIn PDF document text
    • http://lovesenergy.nl/file/zojegatejaf.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/67023072166.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/36066785918.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613072df115b6---pelezezelozujoluxulugupo.pdfIn PDF document text
    • https://tebra.si/userfiles/file/mapurim.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/71aee9c129f495670471fdc8e90db648/50693649990.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161445c2fd7686---80864840461.pdfIn PDF document text
    • http://megalaserasia.com/upload///2868574595.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/sekunefuwefapevujan.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/43220711948.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/97689123348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=watch+spiderman+into+the+spiderverse+free+onlinePDF 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_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 10944 bytes
SHA-256: b2ad3d525c59df0dab0c96819e6caa2c9bb71769258555e1db9b2233ea1a9cb2
font_02_sfnt_off00011520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11520 18168 bytes
SHA-256: 37adc9afaa60bc4118b0be770dfefd6a59ace98e006a492b933a22c1a74a31c6

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