Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f160295a7d1362…

MALICIOUS

PDF

90.8 KB Created: 2021-07-08 09:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e7292380b6176419a70f545e814faf7 SHA-1: 8c4be3e744db9508e245662f41ce5b68d5db1906 SHA-256: 33f160295a7d13627671b5748423f5c0c2b99cfed2605edd96e2e71f5547af17
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f22d51a927c3c13da199217fa445259d/kipezegifasugizaguvotof.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7e0078ff3b2873a813ec40318fd4bf75/tozonixiterajiv.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4afc23ef3b---17863086577.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2d9d011b6d7891b7ae134abaed81c45b/vekegobezamixu.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/c9nqlv3n3ohnn0drb3armobjv6/fuvujolalezuj.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/vufituje.pdf
    • http://buergerforum-tirol.at/file/vunapiwifejezid.pdf
    • https://alshaabcoop.com/userfiles/file/vijixawofuxesavo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a260b61f1b8---sezitakuferinotipanaze.pdf
    • http://syarmarka.ru/userfiles/files/bijilaninegix.pdf
    • http://carrozzeriardue.it/userfiles/files/31191351973.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/o038b8kt3tuuhvm7b7t6aobgl5/bisezuwarofo.pdf
    • http://vdadanang.vn/app/webroot/assets/files/kedizojategutalu.pdf
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/31203672805.pdf
    • http://angarakshaksecurity.com/userfiles/file/66633822498.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba87447804---dijuw.pdf
    • https://hamzsabegi60szallo.hu/UserFiles/File/pokurojoj.pdf
    • https://zebcom.in/userfiles/file/lurexodanavoximexeluja.pdf
    • https://vestol.bg/files/file/98650812801.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e1ac65d0cd1875746cab39a301cdd165/riregisajexabizizu.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/10557c5e48581bf7b79aaed11e8924ce/dofijivusuponagamelotugik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=conver+pdf+file+to+word
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3b.bin
4e23f8fb6601aa3088d35adbb8a93e7a015a09324d7fe08eab521d62368b3abe
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 10344 bytes
font_01_sfnt_off000102b1.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 16144 bytes
font_02_sfnt_off00011830.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 16792 bytes
font_03_sfnt_off00013042.bin
38a178b2875c8235a5566f99b052f9cd5c264dc465eab7aa18dc30f5a0aca7a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13042 17268 bytes