Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a31307f844c38ab…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 04:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 6afb12de5556f51b1fd13cf5874b3905 SHA-1: 3c144cafdff39a2ed1165ad632b9672d932a4a53 SHA-256: 5a31307f844c38ab0e8e1009a7a41c7a668395c46f7be75cc35271ddccde6fca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://abisspaandboutique.com/nbloom/fckuploads/file/dovegoxinowutamefelok.pdf In PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420c3404aaf---45572204831.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/g0me0uehlch05r3pla2u9jlj7p/88404335195.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/jejoxubovikujutokusugiv.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/wofuwiruduzizibimike.pdfIn PDF document text
    • http://www.polni.si/Images/files/tukaxixajijexijazamavarif.pdfIn PDF document text
    • http://asid.rw/userfiles/file/saletatevijilalewavu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342d13988bc---pawuziduloxijabojevanomej.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/afbe95926d4a2d467da81c3561af56d3/dorusulufigawiguziz.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/jijefevojavugisuzazuxapa.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/8173733890.pdfIn PDF document text
    • https://auto826.com/uploads/files/povawuli.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/46147752875.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/25538710203.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8998bdcc904f30b4ba4772fbc6a3d7d1/duwoderujodojojorisa.pdfIn PDF document text
    • https://maria-galland.ru/files/file/41577792219.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/60362990929.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/68282894270.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/37085246762.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/88341157417.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/nutuvokugoka.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/lekol.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/gunuruzomipadapadosun.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/fepujodifefimolewolifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=example+of+free+verse+poem+about+lovePDF 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_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 17960 bytes
SHA-256: ac5d81100a3b3359b3b9477dffb5aec284f4386b552c7ddd1a6b16e6ff3b9899
font_02_sfnt_off0001272e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272E 10712 bytes
SHA-256: 0ba7998ac972c1c2e5a954ae5d39784aab2639166a9b9213144e4ee614b53e99

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