Malicious PDF — malware analysis report

Static analysis result for SHA-256 274de784d5702871…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 20:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: acea613edcd10a5ac2bd341d0550e943 SHA-1: d73b78bc82e141a10b68685f9c1d72281288cfae SHA-256: 274de784d57028718813ff3f2666fe2116aba510e017199265c0c81b0dbe6b96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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 ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://allytemp.ru/uplcv?utm_term=oriya+tv+app+download+apk PDF link annotation
    • http://werder-ritter.de/UserFiles/File/1651465423.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/12016833259.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/85023046875.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/93181258625.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///kekugadubaxixakimabavufow.pdfIn PDF document text
    • http://eventechsite.com/files/files/36392878443.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/25547220206.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/8907369122.pdfIn PDF document text
    • http://ducnhua.com/upload/files/soluni.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/778112193.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/gawamozugufoge.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/senatifiwelijoguwikiju.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70bb2a2f7---26187892755.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/vexipexowopedonanumakutet.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c82a9b6344---mibofarovokoj.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/wemetamegovid.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/jaditomewobenaba.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/51704756638.pdfIn PDF document text
    • http://seamacros.com/upload/file/musazikozo.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613749e16b7da---85601112127.pdfIn PDF document text
    • http://archbot.pl/files/file/39339139295.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///xojiluvorerasesadatola.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/94823436332.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/danusenifuwojes.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/zosovebejesut.pdfIn PDF document text
    • 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_off0000d4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D2 10468 bytes
SHA-256: 508318f00404cc22549330f5f3b6c6d45dd5c75df4d648f52aeaa3eeaa0a7218
font_01_sfnt_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 17652 bytes
SHA-256: 45f3159c53a365e24ae05e01c3e360789494bd155d48caebf388bd70410a71cd

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