Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f18bee6fc2eaa9…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 06:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c116e3e9c69657b9fa1dc9537a10a526 SHA-1: 3e5b6cb4b0943cadf10e42a2dba95bed8c471bf8 SHA-256: 31f18bee6fc2eaa95bdb2172cd85186c9fccad06275541259695b569ed6724bf
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://asiquim.com/ckfinder/userfiles/files/91756813585.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/akpk4t1vaj6m7t891nhrlqhbf0/61773666224.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/kogudaponifevujep.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f02aca900---92539993610.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/baxexugexiv.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/i4q6e5cn3966hagnm1n3sl17t4/15416799604.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/lagigegujadosobe.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/kemilutegofinimokasuzeg.pdfIn PDF document text
    • https://ego-sofa.tw/uploads//files/202108050954454832.pdfIn PDF document text
    • https://parfumzone.ro/files/file/53729729193.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bcbcddabe---medavidufe.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/12087206612.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/dutulegomiribopakowize.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/tifimetewuwipidikufep.pdfIn PDF document text
    • http://www.77ice.com/upload/files/tuxovitu.pdfIn PDF document text
    • http://cli-kh.com/uploads/files/202108200347469187.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609e013b6d92e---8238952059.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/xivitepajijaronejezalo.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/77945047759.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64db95e4e5---20297710631.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/28305113466.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/timigew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pdf+page+too+large+to+printPDF 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_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 10504 bytes
SHA-256: 1f9e2ac23ad380eb1310994c2f77cceaf70bcbcc2bfa188ad10ce3e64c2d5da3
font_02_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 17144 bytes
SHA-256: 024a5f37541a093ce48754aa82b8c56d8d4c77e24b98ad7c8ca06533bc4b7f45

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