Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef49a81fbb2830e7…

MALICIOUS

PDF

78.7 KB Created: 2021-07-15 21:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ac7726726016dc8f488392b3f201c1a SHA-1: d40793290bcabbffcc49b20c086e1bfa1e2fcd52 SHA-256: ef49a81fbb2830e7410a97a24bb0f7f49e859ad16b283c1a85a6f9c199a2caed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted from this sample, but the presence of numerous suspicious URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d44819c90---tixirozijukupukoluritepox.pdf
    • https://pasarant0g3l-turbo-h1t.com/contents//files/45035397802.pdf
    • http://elmbbq.com/uploads/files/gejixag.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749c3ef2e73---kosopuzipiwisogimun.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/kugimuwugej.pdf
    • http://pokeocncafe.com/uploads/files/79105087298.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/8vqcs3sasr8hihtu72hcbd0ffo/43596022545.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/mf6ncku4igjfju9mde1ktjq3o2/sojukugigemelalom.pdf
    • http://www.findvoters.com/userfiles/file/97586266041.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8131543b3a---18813352242.pdf
    • http://tomaszskiba.com/userfiles/file/50134018369.pdf
    • https://elminhaj.org/userfiles/file/7315471050.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099a46292152---duwagozige.pdf
    • http://burchiellati.com/file_fck/file/raterevilexonetelogixas.pdf
    • https://ystechpro.com/nbloom/fckuploads/file/diziwosolojale.pdf
    • http://kirakuramenandsushi.com/uploads/files/65629512217.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/beruvazosuwatobupimimegug.pdf
    • https://penal-garazh.ru/files/21068682373.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/1e1672518e9166b94d8f3e503b75f41f/puduke.pdf
    • http://easyliveconstruction.com/ci/userfiles/files/voxoxagumenexetodefe.pdf
    • http://aaaexpressheating.com/userfiles/file/24568794784.pdf
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/77063019325.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/9c5cfc6a369e6a35432da54f96b3a987/xujisovepotobotufiguve.pdf
    • https://taevlingar.se/images/pages/file/14504677059.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=toyota+sewing+machine+manuals+free+download
    • 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_off0000d034.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 16792 bytes
font_01_sfnt_off0000e84b.bin
2b152708c0dc0405e093a1d09c5a203134b69821715aaaf01c9c7f0d7139d717
pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 11184 bytes
font_02_sfnt_off00010224.bin
e299d0aa709d6eec56e43566dd5300d213c6d5697d0f80bc5988819842646e6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 16104 bytes