Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f41b7155710661…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 18:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c8d90e7380b384909ac7c88f71e5035b SHA-1: 0b9cc01188c174a9bcf5f9055a99b55bbc777ae7 SHA-256: b4f41b71557106612fc4913dc79d41210e6d0a00cac4ae5a5b90fc5579083d28
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, and heuristics indicate it's an image-based lure with clickable links. The document body is heavily obfuscated, but the presence of numerous external URIs, including those hosted on compromised WordPress sites and disposable domains, strongly suggests a phishing or malware distribution attempt. The primary attack pattern involves tricking the user into clicking a link that leads to a malicious site or payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://smidgel.ru/uplcv?utm_term=what+kind+of+car+is+lightning+mcqueen PDF link annotation
    • http://healthywithhart.com/res/file/zulubakesiwogikuponazekiz.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420a3114c1a---pupusasojude.pdfIn PDF document text
    • https://hgb.se/filer/file/5992400823.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/6477605026.pdfIn PDF document text
    • http://ijiantu.com/filespath/files/20210929145044.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/43177275561.pdfIn PDF document text
    • http://gardatrans.com/content/Files/tasokonizuwikixokep.pdfIn PDF document text
    • http://preiss.at/upload_files/files/tupedobu.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/5119024213.pdfIn PDF document text
    • https://combrooncom.com/contents/files/jidezimoladusinipufafa.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/kedinodanosun.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/98667943991.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/dulexanofazilepikebamage.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614af00767ac0---bijenifibozalog.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/73843144443.pdfIn PDF document text
    • http://dakov.hu/_user/file/24019213358.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307046b9235---16517318811.pdfIn PDF document text
    • http://fittbikese.hu/files/file/suribavevewuvetar.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/monivodizojununijupodexof.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/90499212977.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/relawavelike.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/lizusuloxomumimojamezegum.pdfIn PDF document text
    • https://drlanda.hu/user/file/34497910046.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bffc82946---30344176215.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/woguzisulapifibidujixopu.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_off0000b4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B9 14104 bytes
SHA-256: 428dc7648fbfccc655cc7959bf2ab8cf3b35e2e1524ba6483cf9cf3314109417
font_01_sfnt_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 11252 bytes
SHA-256: 5bba9fd00e1be93a65f899ad8034aeec3fd176bb04324fc755d8cbb54bc11c7e

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