Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab76aacfd8f2ead…

MALICIOUS

PDF

83.3 KB Created: 2021-08-19 19:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 68a73a5e33c8a8d7962aac536c8abb9c SHA-1: 392532b93bbc3902d077448dfd10016863759c01 SHA-256: cab76aacfd8f2eada82c88b34721dcd9cf800c42e3523bbea0a0dff6bd9da41f
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to manipulate search engine results or distribute further malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/bodoliguj.pdf In PDF document text
    • https://artbynela.com/uploads/file/6361208987.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/61277563941.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/dejubafuvedokesedobu.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/42544757470.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/goduj.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/91193102261.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a824f8c4eb2b724d078921f7e6b7c814/fejopilopipes.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d2b9eb76a---85740074717.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202108180557554605.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b27d6c296---giwemisetapaveruz.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/losebak.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/14459855124.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070208141140.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/30520820607.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607089ca670a7---82913869410.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d725b96da6589dfc1ad1aab167b633af/80618684977.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/73418251313.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9117ea0d1bf55dfc1eca3b0a7a96715a/saxazelejenusobisadaduf.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4bb876036---watezakekaxefibelofabom.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/gosutadolubadulelizerisig.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/82766599895.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/u27ub4at0m4e9ir5j9segnec48/wononomonokonidigin.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/c35qk19bh3h7vmgassq0t5bckj/lijedinagigoro.pdfIn PDF document text
    • https://0900107678.com/upload/file/16491130756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+are+good+pulse+oximeter+readingsPDF 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_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 16452 bytes
SHA-256: 9f00940236d4b735fd9d81615a508015d09e6c740264483631a4c84251c7355f
font_01_sfnt_off00010c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 11032 bytes
SHA-256: 1c41b74a8ec0d56b90cbe79e533af9976672fbacc9018570dfd39f1d4531087a
font_02_sfnt_off000125e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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