Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06e9983c03f07ba…

MALICIOUS

PDF

85.4 KB Created: 2021-07-02 08:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b00b836a9af980e21d9ade4887f1dc0e SHA-1: 3d49a3ab0b1ab94c5ed18c1e5abd0e729735897e SHA-256: d06e9983c03f07ba333558022255e18e05c92dec73b8cd6edd6e62f83d8871c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c9963b9b2---97579481258.pdf
    • https://acryl-bg.com/userfiles/file/67057542687.pdf
    • http://jr-bang.com/uploadfiles/20210609035947.pdf
    • http://pantryscan.com/123cars/imagefck/file/62311678180.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607196f613e93---3879466101.pdf
    • http://immobilieninvestors.de/userfiles/file/rulotoxew.pdf
    • http://bielwod.com/userfiles/file/69155577730.pdf
    • http://aircond.md/upload_fck/file/dizipogatexi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11cb3731e---jegavomanikafi.pdf
    • http://arch-teh.com/pic/userfile/63388055287.pdf
    • http://phillipsbricksalumni.com/clients/56168/File/21476577520.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160793267a3a01---41882752686.pdf
    • https://nslogisticservice.com/userfiles/files/kukisukebotedojupegujoga.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773882c8779---ripulafebudeviw.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/81dad313fe30df4cafdc4ff4ffee9e70/guvinupajesefejo.pdf
    • https://repare-ton-smartphone.com/userfiles/file/vedipo.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efed0d956d---maronavakeva.pdf
    • http://zonweringnederland.com/ckfinder/userfiles/files/84652009876.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a214c0000df---bizitujaxibijukasexiv.pdf
    • http://nuovojob.com/userfiles/files/pikajofuzotexoxifo.pdf
    • https://gachbinhduong.com/upload/file/57967000900.pdf
    • http://ansing.nl/userfiles/file/21356936409.pdf
    • http://bukharaalpharetta.com/sites/default/files/file/tipumelobavemugogave.pdf
    • http://birzebbugastpetersfc.com/files/file/61317376420.pdf
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/13726525425.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=bernoulli+differential+equation+problems+and+solutions
    • 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_off0000e5f7.bin
801d896f28a7d4949594856ecf3282a317c9689ebca4bd141bd3945c7afdffac
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 11096 bytes
font_01_sfnt_off0000ff59.bin
1f7b8f989d1fa10373aea574ef00e771ee3808ba7277805a97be20bb7387faa6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 17520 bytes
font_02_sfnt_off00012db5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB5 16792 bytes