Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5d4d9d990032c5…

MALICIOUS

PDF

80.7 KB Created: 2021-08-07 02:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef737a2ed8e61142e3e45b7b3cc489e0 SHA-1: 3b5369c10026c5eaf2ef537cbf909dfd34fb5bb2 SHA-256: 1a5d4d9d990032c5a832ef92991de57685475d9bab78ff7293e5a2c7a3da5cbb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of multiple distinct hosts hosting these links reinforces the pattern of a distributed phishing or malware distribution campaign.

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 https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/bv8epng1cpk67g4vg4f5d3eg21/tamamanukefowitomed.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16105b58c2d501---43486878496.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aec0fdc89d4---junujozugubo.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/v16c88rvpvkpf2ue5nud75p6j0/didepuxomubepis.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/9dd1cf8a8ab72bbf18d8a18d200abba6/nosunudilotasesuvezevoxa.pdf
    • http://grimastone.ru/files/30134643889.pdf
    • http://houselandia.ru/files/vasuwawijuxawamewogo.pdf
    • http://elma-itc.ru/!upload/files/79408294689.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebaa8a6544---52997600131.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/21699938058.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/3150fca7ea83197f56230c853482f63b/nexegikimirefukevor.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbbab6f9c0---vawakugexikilolesim.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787267a53e5---45602310937.pdf
    • http://ombs.ru/uploads/files/76554450904.pdf
    • http://hasyo.net/files/file/34612249417.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94f0dc3b57---6477795533.pdf
    • http://rockhousemethod.com/ckfinder/userfiles/files/12644381150.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2cba9be70---xesururab.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowopanof.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/de073a9a5b3111eb44aaf9826f7646b1/11538123699.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16088fc84ead23---gawubusokawimukozemal.pdf
    • http://freetds.net/userfiles/file/7873025450.pdf
    • https://die-elke.de/cms/elke_page_files/file/lavufowu.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a156ea5fe53---5144880231.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+mission+impossible+1+dual+audio+480p
    • 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_off0000d3bc.bin
6dd1a485073c8fac0e1178ca3cb260ec308cd125a8815d404dd78314c9df2e72
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 16976 bytes
font_01_sfnt_off0000fff4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 16792 bytes
font_02_sfnt_off0001180b.bin
ee20deb60b7924dd327f814f11dfadf8d3587bdf604714782c98ad4a32e7bc88
pdf-font-stream PDF embedded font (sfnt) at offset 0x1180B 11144 bytes