Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeac607c7485b9b6…

MALICIOUS

PDF

86.3 KB Created: 2021-09-03 23:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 43d67b4b7da2d01e1c144bb63c2bf609 SHA-1: 26a2b5871c30d2267a286caab344727fe1695775 SHA-256: aeac607c7485b9b665d57f9ba6521c8f5edcee11f498e595f3d752a9bb5795fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or downloads. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cbd3efcda6f---puzodokerakefu.pdf In PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5b9999a4bd1f214eaca8f448b9bb718f/butuvukulojunat.pdfIn PDF document text
    • https://dineflon.com//files/nazilaguxiwatowu.pdfIn PDF document text
    • https://viceda.com/userfiles/file/60572102719.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbca3fb5406---10373934854.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/12689473494.pdfIn PDF document text
    • https://marosme.ro/hirek/file/6491564515.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/33852580613.pdfIn PDF document text
    • http://test-immo.com/file/wigefogafun.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/tigawuxenamulula.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/38631632814.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/13999589794.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/reposimetezifedasewidoj.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/sosim.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa9a4807bf---40245819352.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/zazesemovimo.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3cf7e9f0d---20609445378.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/papamivimopoxofowojewawur.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xiwekekinuseduniluwin.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dba331f43---24313507774.pdfIn PDF document text
    • https://curvy.tw/upload/files/xifimoj.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/de19bfeb4d644e49ed5f209e30e8407b/64332890218.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/tisomolidiwibojom.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61379b7152---393221252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=manually+download+windows+defender+virus+definitionsPDF 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_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 10708 bytes
SHA-256: 06d0a4f2f5cc7f7875ca0c69b951aec346f5d0ae4e73685d13980f30ef242540
font_01_sfnt_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 17860 bytes
SHA-256: 61f5ecf9978381ca07ac4919654e4f76080ad554ca38766d6211970f807919a3
font_02_sfnt_off000132dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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