Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d482101b55b710…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 21:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 861bc8a0f6e8ff39238095d0ecea159f SHA-1: 8cf81bd7cd28dcc76b191dfc259564967d327bdb SHA-256: d9d482101b55b71046a2480f3b3850b9f1383ce1a90fa8642fe7d287d95891a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall detection profile strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://crewmak.ru/uplcv?utm_term=best+military+power+in+the+world PDF link annotation
    • http://angarakshaksecurity.com/userfiles/file/25875898616.pdfIn PDF document text
    • https://hagepoorter.be/files/files/mudabalapekotoguxem.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/5tprmk42mg7edlstq2nkdli9i1/19362775792.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/80532734330.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db4a8e43f8---44163757466.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/25799663893.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/33d2272d51dee78b290bdd28c7e5b37a/29193675455.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/cd88e9a24d18926d83b2ef418156a1eb/repewitazimalu.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/kenosarotetajuzukij.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/70307242329.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/pojatapaseruremeb.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83f47ca87---gifubuvokuroxozokipobe.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/7pf5gqtqce7fv2lhjro4j6qkb2/zuliresonizilijuve.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ktnjv5b0rsus2vavv6erl3gnrf/18962729759.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/eab3989b016f7d62f0b96853260ee72d/vodikotefa.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b210558244---6037703510.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/zonowe.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaeef19ba0---fedajevomu.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dbd82cfa6---gezeseduxu.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f423e17340---bupapa.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/xevadokogatapup.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607739baf098b---garezugedijusasekimu.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/fbaeb831af1a07f910b1ef27ade96ec3/zelegudegaxeni.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c215c447820---tajizumejuwifazod.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6c112f388f4e04cad12ddb10d440f638/77083011982.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7c93948607d8632709a56041956d2365/dalifaropa.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_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 16884 bytes
SHA-256: c488127c96473bd605ccad169e6abe8f5029e23bb9975b308b482f1cd6754978
font_02_sfnt_off00013042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13042 10912 bytes
SHA-256: 0888430077b5e4f3efb5d9dede57aefe3b3e2e76aa4ac270c58443375b28d62d