Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe1978f16c1aac5…

MALICIOUS

PDF

84.8 KB Created: 2021-08-17 23:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a68652ccee77f381f35f05c6d5fdc12b SHA-1: 5b5791e05c75ba562960524e4f7b61234e367fb3 SHA-256: 1fe1978f16c1aac5af0bd1119268dd093fa2c3674ad59ec5c4591517ecbc9a17
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure itself is identified as a link farm on disposable hosting, further supporting its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/24jmn7c408fk9fkp7jq7vmv5iv/vumixitilulapefu.pdf In PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/mejugadivoku.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/joror.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/2mqg6cbeah5iq17iv7gtc6g41d/rekunuvuwosobevefebaxoz.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7lvu84evb22pfqsc7m77psrktt/baxefagedobowotuber.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/19083633928.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/60548582199.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/40016937278.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d1a57bd00---nanenijinofumozakegisugo.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/jusujivikoxapujozajuduxe.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/klilmkrqj71g4amok7nbm0b7mi/mebowogezojal.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/802d1c1faa9e0ee7bcc436d3e5c0926d/dojonekurifatoradut.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8t8hnqur1v5v6akpocv5hg6543/15104483575.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/lvuepfcsna72p7sus4bbpjgol5/gajipaxomeludegumir.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/58171483778.pdfIn PDF document text
    • http://stattus.com/assets/file/62287189418.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160abf654e9641---34195363353.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160998681b4418---fitexafebexuzu.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/dovasulew.pdfIn PDF document text
    • http://stonebreaker.at/zutemogonakelot.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/c5807ddf88acdbe58680d3d4b2d795d0/dijuxapukexatep.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0af87b32---64583316006.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6a8ef22d2d6ef76124511b29a90b6bc8/saven.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/46357969166.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2fb93744a1804e31a65357abd96bc7f0/goburetedugo.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609754ba552b8---17008004590.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ecb03b4eb---30126034470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=astronomy+books+pdf+freePDF 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_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 16924 bytes
SHA-256: be91da2654bf08b9bffc59265e2abe8afe13806466b59a7c5880bafc2e47ca08
font_02_sfnt_off00012bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCD 10688 bytes
SHA-256: b9caf4a69f86d58dfef65d4e34a9e3d8024b34b412d8d07e3a06787e3a7ec99b

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