Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d7acd46024f306…

MALICIOUS

PDF

131.6 KB Created: 2021-08-14 05:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35e473dc3452d84f8fd15b951ca659b9 SHA-1: d2d8751a45bd27c254f15115b6e8ce86c9762251 SHA-256: b0d7acd46024f306c1566db6099237b009ecdc8df13928548416400468694201
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9845

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=how+to+generate+jacoco+report+gradle PDF link annotation
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/fa76c47b89cf441477c349791bee2a57/fuserudisabexivupir.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/xixaduzofofopasufo.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/40088508185.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/90166513733.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fbc405f708b83dc24f03373ae8c01cc8/ronarop.pdfIn PDF document text
    • https://istanajp2.com/contents//files/34015322558.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/dd436ce8d472770501202d2e07523287/13208045383.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/11317676803.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/74771061786.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ec789736---suzitiraxasatawimokono.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/sojuvuzovujepudozebiz.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/88c476618e6adeeb83d9cd712402f144/kavidukigo.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0544dc5d12ea9fb0a849ae6f02eb201e/xifok.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/427522a669b96d664b9db209d91b6a8f/98024691477.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/80387366873.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/7ira3duo91ps34sd4hq5n056vr/87938943037.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/68583930619.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d408b748d---busesadumumupoli.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ee68e8c7434---bunofufenijabi.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84a6938517---10708938077.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/widejologubijab.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/golexesolezogisun.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/57800189179.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609506953b04c---64105783127.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E13 30660 bytes
SHA-256: f1c1243672eb876ad6027fa27c769017155d26e348aa5ba17833cb394b0abfe1
font_01_sfnt_off00018b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A395 23060 bytes
SHA-256: 53dc4cda9c8f8485fe6a7f95501645a404eec2a5ed4ac83d0b578ce03614b0a9
font_03_sfnt_off0001e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E61D 10636 bytes
SHA-256: faabfd7ecb05434e351d1ac3c221cc3cb365f676e22c075827dbd788ee0c5c73

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