Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee64d44bb5fdda1…

MALICIOUS

PDF

70.2 KB Created: 2021-09-19 06:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3bcf8e9367832661c1949e49f42b25a SHA-1: a1ec71f2b374a39c1ead7be00b6b596e4e3e48a5 SHA-256: cee64d44bb5fdda17a72138ba6d3ac797a9030fbece7c56319f09d86652b010f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS platforms. The presence of numerous URLs, many with UTM parameters, suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=wifi+analytics+app PDF link annotation
    • http://preciz.com/uploads/wysiwyg/files/figurexujatiniku.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/vamav.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/fomabelodagatatewuxuta.pdfIn PDF document text
    • https://12shio2.com/contents/files/12906339668.pdfIn PDF document text
    • https://activepymes.com/pub/file/75253272084.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210917183815_j3osak.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139c69a3a431---73379683725.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/92433053387.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/wurumizelixomuvatuf.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6005ae36---wilopimefikuvapegul.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/dedaz.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d20eeed8523ec0ae0106bcfbe3e35fb0/gawuxewomurud.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409fefb9a7f---22680271378.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/wogalotuvawuwowevisevefu.pdfIn PDF document text
    • http://ahppesticide.com/userfiles/file/zizume.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/50429011115.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/vidunazevafow.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/2496369446.pdfIn PDF document text
    • http://skupka23.ru/upload/m/sevusoviviwudigamif.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/75469762385.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/73163479087.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/59236385853.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/jukiwin.pdfIn PDF document text
    • https://2acontractor.it/images/file/93364352468.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_off0000b4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE6 10228 bytes
SHA-256: dfd418c78c7552ca16be00eedacd878ab3e4d632d9816d57b571ca9e2502b094
font_02_sfnt_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 15392 bytes
SHA-256: f1203bd14122ee4a361ac11055cb072b68d27f635a5ffe75fc2a9cb09e27a65b

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