Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b76f3e1c89beb7…

MALICIOUS

PDF

71.4 KB Created: 2021-09-21 06:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 047547f5d2bbb20e3a30134fad19c096 SHA-1: 74a83c0d827b888ab2102889528400614edb653f SHA-256: 02b76f3e1c89beb73a920511338f49fb3489e3c0ffe9a6da3b3c7ffd8f45fc33
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a link farm on disposable hosting further supports this, aiming to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://stylekd.ru/files/tizabunebomulomobukok.pdf
    • https://momentous-inst.com/uploads/image/files/69770809974.pdf
    • http://defhjdr.friend-match.com/upload/files/kukadeduvaz.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423525254ce---9339029851.pdf
    • http://tecniagua.es/uploads/ckfinder/files/zorazifud.pdf
    • http://rubivina.com/Images_upload/files/62183459749.pdf
    • http://nsk-nalogov.net/upload/files/badizogajafurazu.pdf
    • https://dnm.tw/uploads/files/202109120348363651.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/53296340598.pdf
    • https://ewt.cz/res/file/57331057487.pdf
    • http://vtvxm.vn/userfiles/file/guwanenurobofaxujepud.pdf
    • http://jfe.hk/userfiles/povanipizi.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443bb60ea2e---pavarokogoweripomeru.pdf
    • http://sumtinathholidays.com/admin/uploadfiles/file/87510434317.pdf
    • https://bvphcn.bdata.vn/upload/files/65325159773.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/48c1bce399622b27b36b084df7c9f15d/nositezum.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/88de1c33caf8bca279653154453e136d/kefosetebedokapid.pdf
    • https://currenwatch.myhost360.cn/file/upload/files/09-10-14-14-55-79.pdf
    • http://posicert.com/upload_fck/file/2021-9-12/20210912045949676653.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/nemokirapoderesa.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1da1b9649---gerividolo.pdf
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dajuxa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+dream+tv+apk
    • https://rt9.rspo.org/ckfinder/userfiles/files/gesalibejebawup.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6fe.bin
54f27dda3d797dd1faa5e1902eea5e0458005964990d3a86d925b4e46dd5c3d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FE 16068 bytes
font_01_sfnt_off0000e028.bin
99f3aa1769af5282c4bec151970c89ddc6726b391b09bbe4e541ad2b43d9d65b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 10540 bytes
font_02_sfnt_off0000f836.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 16792 bytes