Malicious PDF — malware analysis report

Static analysis result for SHA-256 0406d2cacbf00b04…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 07:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 009121d33a7ea1b9734256425acba471 SHA-1: 844eedc3a1e1049ea167ebf39f3278df18246546 SHA-256: 0406d2cacbf00b04b1380d2b6a0004aae3efa1e6eac2052b5664993d20a6a569
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, utilizing compromised CMS uploads and disposable hosting to obscure its true destination. The embedded URLs, despite some being marked benign, contribute to the overall obfuscation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dekobonner.de/userfiles/file/90537737547.pdf In PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/kovupikasiwodiriz.pdfIn PDF document text
    • http://come2menorca.com/images/file/pebizinukajunezimesa.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/24617446169.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161130f2f5e846---33534620716.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/86465403530.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/kasokivikibijuj.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/10871472974.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/37650549158.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/1af33cdf68502678b8058ae2b18d9f4f/93961448225.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/zometefelajobefinasefaw.pdfIn PDF document text
    • http://generoussecurity.com/uploads/nogonogebizijawasawojurom.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/kujagafomudapukino.pdfIn PDF document text
    • http://geose.ru/userfiles/file/worunuvabazezasesaluwuvit.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/wipujomakoburofivozi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/t5lf0nql50fc57po1jtkn3ksvr/xexetovotapunoravelomu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ca32c81b0---zogasanofirabijaki.pdfIn PDF document text
    • http://jaika.in/images/documents/files/godinoponusijaripiwisaw.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/94557898592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=henry+iv+part+1+pdfPDF link annotation
    • 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_off0000d39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39F 10380 bytes
SHA-256: 9fd950f9dc793ca46809451117b1b55592f45d4421740e302c8761f43a7d2a9a
font_01_sfnt_off0000eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB39 18352 bytes
SHA-256: 13cf68eeed28f3f3585879801b69d533084448f9b5ee68e953c1aa44ce201116
font_02_sfnt_off00011b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1