Malicious PDF — malware analysis report

Static analysis result for SHA-256 a449ff05dac378eb…

MALICIOUS

PDF

84.5 KB Created: 2021-08-15 05:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2000928bd98cbfc90fd7f7a70ecb8ed SHA-1: 3c7dcc044c1b6a28b1af7273e036873d13aec221 SHA-256: a449ff05dac378eb5ebeef434f93afb23a11415d1101674d8c180f1693a47aed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_CALLBACK_LURE' indicates a phishing or tech-support scam pattern, and ClamAV detection confirms its malicious nature. The document body is heavily obfuscated and appears to be metadata rather than user-readable content, but the presence of external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pistant.ru/uplcv?utm_term=utilitech+2+outlet+timer+instructions PDF link annotation
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a494f2625e2ea072f6dab349a39aa2ca/10603021612.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6cea9d0c70d4ca0238c6e16c5d1925b1/26357175408.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/090facb200611c58911b5248ca61d845/45233043861.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/nevavokilomibujupesejasa.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072499305e61---41284906053.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/fbbsu0bdrecqggsrg4g4mhla0m/58542252028.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/98679286447.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210815082331.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/fegajebeko.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/juwaritulijimapejutosove.pdfIn PDF document text
    • http://becucci.it/userfiles/files/31365520452.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2r6i6oh0520tc737hros6692sf/72393174083.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ccfe4cce---38132924225.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/7nfldd244ul3n40d903vifr40v/33665531455.pdfIn PDF document text
    • http://beiks.info/public/file/16996867716.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/kituzugabo.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/gumawurekofobaviwaguw.pdfIn PDF document text
    • http://unityproductions.com/upload/files/97780779329.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/gizivojafuk.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf8e41a0cf---79211493990.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/3984527678.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/sofibotorakija.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/regoku.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF89 17856 bytes
SHA-256: f196d0310284c59af2ef5142afa3c1c95202cebb4ea2925a1fdffb6488b6abf7
font_01_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
font_02_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 10560 bytes
SHA-256: 455e77416adce30bb31a5ebce881cb9c1ef130e77d1801e229366c2ac468f540
font_03_sfnt_off00012c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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