Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f28130c0921084d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 14:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c887fea59ef1c48b9f7621d7935796c5 SHA-1: 3c26fecf6412b4bcfacb1fc558c8f12ef12cab34 SHA-256: 6f28130c0921084d26a98bcb0f36c4dc81f24dad538ef3ac58d14def3375642a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://philabc.ru/uplcv?utm_term=android+market+for+pc PDF link annotation
    • http://newmob.it/userfiles/files/4263423039.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/77321233330.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/41647755958.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/81098725785.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/58742131439.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/bupofigi.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/vetipu.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e9078721---latawix.pdfIn PDF document text
    • http://leton.pl/userfiles/file/rezugax.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/vdju4qsh3vvahajoj6vd3m8qvs/wibapewovuzoze.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/zakirixo.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/xobotapuseki.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/jewevowatudujikedelolebu.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/sozebevefijosobogijisale.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/27743608512.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/92732646276.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/41938082554.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/96660634583.pdfIn PDF document text
    • http://sartor.ru/upload/files/wigisivajenajunokubo.pdfIn PDF document text
    • http://markone-tools.com/upload/files/54378458911.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/72908976126.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ee5b2365---nanilovutar.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/82336294005.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/92492917508.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/43973190517.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/pasumuvipubamerozavijul.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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 17872 bytes
SHA-256: fdbc63f92c5115a206574c83912149f7616b273bdcc46843a902139d30277512
font_01_sfnt_off00010c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5C 10640 bytes
SHA-256: dc1599d60e5fefeab5b325285c05a59118348710991cb880d31a510d5544a376
font_02_sfnt_off000124b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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