Malicious PDF — malware analysis report

Static analysis result for SHA-256 77644d49cf1e4ea5…

MALICIOUS

PDF

69.9 KB Created: 2021-09-02 04:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4fa645f1977d51775575dbf744ace7f7 SHA-1: 5c61fe901365f73087458b7fc26a9ca2b044402c SHA-256: 77644d49cf1e4ea53a4d794183bb8118be18298e104d7a4720e09dd06c8ace90
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF is designed as a lure, presenting itself as an image to hide clickable links. It contains numerous external URIs pointing to compromised WordPress sites, which in turn host further PDFs. These PDFs likely serve as link farms, redirecting users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cructi.ru/uplcv?utm_term=how+to+boil+eggs+perfectly PDF link annotation
    • https://tenfci.org/userfiles/file/vofabazoxutal.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/52374609181f7672818c9da762bdb23b/pitolusutosese.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8954t6a8vf2bsh4g80t1hlbu1m/63786395725.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/mesonigudefuzimulozolule.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab12770a98---lazoxiz.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/waxugipigorudifesa.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/xipineb.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/99021890602.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/91049912582.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/lesuwagutaguzasazezule.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/fiwewepoputixomilosa.pdfIn PDF document text
    • http://unseretochter.ch/images/file/96157047076.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b10621993---68862998188.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/pujubezilavitosepatax.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/3901791541.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/wapavulepopibox.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/merebofem.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/xajizamifowuvenugojaz.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/gavodanin.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/36491693632.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ea4303ceb190676d9a81e9d2feb1c179/85266367146.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/9bb0r50lr9k1etia1jes1oefe7/66011919180.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_off0000b575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 14368 bytes
SHA-256: 1643678b4f4df7c3483f3c081c32245d4797c59a6fb3c58801a534e5d77e164c
font_02_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 10720 bytes
SHA-256: 4890561aa7d11b5bf7640816921ceec26374e7bca6ec968c40b829bdec2b345f

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