Malicious PDF — malware analysis report

Static analysis result for SHA-256 7435a73550ea1396…

MALICIOUS

PDF

84.1 KB Created: 2021-07-03 07:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4a8677d35d6b7031c3d94bf632554c3 SHA-1: 03cd51d00abaa609606d0536ad95527123e73fc2 SHA-256: 7435a73550ea13966d2d84c05613d28b4bf165064e186f92deea042c9bb809a5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many external links strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://self119.net/upload/userfiles/2021/06/files/210626133010.pdf
    • http://dogninja.com/userfiles/files/19166034433.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769236381f7---ratemawebizud.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d59fb28424d132369c44ae1a0e5e270f/4009593717.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16095b76e5ff54---lusidinaxogenorurenudop.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/a01b193076cbd1a469e4b77dc56be179/fumukefaxegovemimaz.pdf
    • https://oliogalanis.com/file/41894852187.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c320712559---41404338308.pdf
    • http://instant-image.net/UserFiles/Site/File/xigiritisow.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4703b486f5---90305973939.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609c4971b4087---puridomotizofe.pdf
    • https://hmanagement.net/userfiles/file/memaxor.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/d39qgrer4ecb5bkqf17s7702aq/zekejipozuvuroxokok.pdf
    • http://curry-box-deluxe.de/userfiles/file/90217147612.pdf
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/4996360853.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1889384de03fce52e0e37b4fc89ef9b6/dagubejom.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac9ab05d6c---16686758194.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4fa39615---46802689900.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/2fd2877f5f93d405ade3195bcd3a086c/53154271964.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160862053af2e3---83302949629.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/5db794c29336749b238427d3661cac26/14292365578.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/xuzalebokof.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f325fe3b---19684970788.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51a85e087---surimidilaraba.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=balancing+and+classifying+chemical+equations+worksheet+answer+key
    • 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_off0000e34b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 16792 bytes
font_01_sfnt_off0000fb62.bin
80b93e142295887ffe04fb262e2bd4f763019253477d8524e5513eec07311e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 11512 bytes
font_02_sfnt_off00011613.bin
71e1db03ff4d2435bb79fcb5bc37c7d853c436d9b0cc6b57352958ed8841f6da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 16928 bytes

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