Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d3bbae3e60e613…

MALICIOUS

PDF

88.0 KB Created: 2021-07-25 23:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6eb295fbbdd709fec1b116821e23c36 SHA-1: 0155ba06f76d0e8298614897ff5d78b54c2b75e3 SHA-256: d9d3bbae3e60e61369e8205103a9ab8e5979bae76e90b2b3738d240f730dda9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jenan.com/ckfinder/userfiles/files/424615412.pdf
    • https://wonkingchina.com/d/files/49775303126.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/pilepukuzelimakowutok.pdf
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sugelunaniwekoxafimoge.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/aanj5jdidnv9nhnspf05aipkj1/vokaratezovirogubi.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae53005ed---lojume.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ea00df15289685023fd3308a34b9de54/koredidapesomamalaber.pdf
    • http://xtra360.net/campannas/file/wimijorazosedakew.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/71604863984.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/92358ee83274530124e20227be1a9238/95744952918.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/b3c3gikkf2qddoj0c5q0urip0o/37169218460.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82100b3a0fb0b06495c96439ada66a0e/lolez.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c25ebbe9ed3f8e508eac842745a1d827/85817061466.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/76e7bb6bcd716f524b8f36add64f15ba/vitubisogosegil.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/cf9664fe66d88d2b4ef198e41c76a2b3/monaxavasiwawovamipur.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ieh1sddt1hflp3j75ese9hj5g5/wigolotad.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/givubodis.pdf
    • http://booklandbooks.com/userfiles/file/giwudonafijedesimiwar.pdf
    • http://marinda.ru/pics/images/file/wozimejujakuxo.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/b3c47acc1adb02b41dad0520ef7ac617/85075597048.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d7cc2fd4a---nadirusapelifopulivizenu.pdf
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/fesabokosino.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b231d9f2de7---37869233115.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609700b059f55---70512909822.pdf
    • https://sonarmusic.hu/up_image/file/woridulogijasodim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=astro+a50+gen+4+mic+not+working+pc
    • 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_off0000f271.bin
db1a52fdf36e0bea901e5741a84f2708f56c6863f3134cb6df6eb96a6266df60
pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 17092 bytes
font_01_sfnt_off00011ecb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 16792 bytes
font_02_sfnt_off000136e2.bin
4738c1f6d89d189aea8abee8557b0f224b2a51496c8dc317d5ec22e170b6f773
pdf-font-stream PDF embedded font (sfnt) at offset 0x136E2 11164 bytes