Malicious PDF — malware analysis report

Static analysis result for SHA-256 d649d8138883f986…

MALICIOUS

PDF

72.9 KB Created: 2021-06-26 14:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42a92d2615768b3256273e783a31d232 SHA-1: 1c293646b629e25ea629388d98bb62e0077a5a29 SHA-256: d649d8138883f9863a4fd1eb431f5ac4a2f22577572aadd8a07ef788a06c0ea4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to be directly executable but serve as lures to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0db3716e---74477573385.pdf
    • http://revucue.com/ckfinder/userfiles/files/62427844051.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb86931e91---getumidigi.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gp1fao1qifv7i9uf3b893f9ql0/53046463107.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704a1ae39cd---51558876103.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aab31de9321---42656047725.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb63dd66ec---biwadomumopifulanarozid.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9ca9ad643d4c2f3817e6b76469e0378/begivusenujosoforifenul.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/47e1459551775835aceca7bfeb9e77f1/25963185689.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e3a040564a6e005d9bbf53b9e6c514f7/fovexezipamifej.pdf
    • https://hobbes-group.com/upload/files/gewademuzarekapoxiga.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75f1885df---wajuxijizajusake.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/mafitazuvubogomarofavo.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cfeec4388b4---lojozasuwoluwesawajibuwon.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/43ab31c947c3b0a251a6e84eb4e04055/11822187343.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/bbf841c6c488de21d4d49b3c4adbdbf3/8212484707.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/26aa3749441c07036f014c0618029fd8/86429285849.pdf
    • http://bluekeydigital.com/images/pic/file/67529096462.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/14d58s9ck1907tu9640q223s0t/80922269602.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5f2447bbcc350100b867e21852b55cbf/77811608767.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609191fc8026e---norofawuwusonudi.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5bcdcc180---52236413489.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/73335175199.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=keesler+air+force+base+commissary
    • 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_off0000bb85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB85 16792 bytes
font_01_sfnt_off0000d39c.bin
6df916be4f1270d4318a81b3d1a4d60f834f19e09687b5f23684fd4512140ca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD39C 10540 bytes
font_02_sfnt_off0000ebab.bin
6020c50f9462124fd3ad47438b7a70bfe9bd38ea938df133bfa788b51a1fbb18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 16408 bytes

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