Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d875daada5baea…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 06:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e94a94f34502c878dd1f7edec5bae4b7 SHA-1: 762426369f432e88a74b8429e9ae5281e1f15bf6 SHA-256: 42d875daada5baea06b79a677c274879bd658ef1b5295b4879f3f5794ef2829b
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ts7ur22vm9knnd2f7j8kvr05l1/nakejexewag.pdf
    • https://onlinendttraining.net/files/jubinajesi.pdf
    • http://auroraenergyproject.it/userfiles/files/defavotofupiwedejoka.pdf
    • http://chokmanee.com/userfiles/file/buwobiwugedozuzorekapid.pdf
    • http://alarcon-v.com/editor_upload_image/file/4717932526.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160903d1f31b63---womoxap.pdf
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/legiwivebineradew.pdf
    • http://mooneyes.pl/userfiles/file/22197836974.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/85bed888bff4a4e7a6ede2bf425255f1/degilizixegajo.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f53ee576---80638889695.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5c0b9d9b7399c2e7c453632ead892209/42064532645.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/cef9a1dab665609f4432316eabe48a6a/jumelul.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/sdm3nitrtukep0h2anjmah5b34/kubet.pdf
    • https://kisikana.hr/userfiles/file/wusojefamejiror.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2edfd00dca16fb8468d306c8694164ca/45617888985.pdf
    • http://melly-incendie.fr/img_db/kapuxopojovaxup.pdf
    • http://www.deewanalarab.com/up_imgs/8932817329.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2afa7bc00---wixewisirubagig.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2e520a12---tozovevazawikux.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6o8evguk7m9vpgkmrumi4l2khi/sevutuvisegapitunopiladu.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074257d1dc98---82349302719.pdf
    • http://antifftech.com/uploadfile/file///2021052110281973.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4b7c3130851882d3cf2c0f6766cafa6a/27182517764.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=doberman+puppies+docked+and+cropped
    • 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_off0000efde.bin
1538336f1e77e44302ae83e270002ccfa66376b18efbb296bdbae29592c2c7b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 10864 bytes
font_01_sfnt_off000108a8.bin
d7fdd7cdf5a3c13119d91e2d0f81c730e1d07686ab95963801372cd2f8b645d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 17144 bytes
font_02_sfnt_off00013597.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13597 16792 bytes