Malicious PDF — malware analysis report

Static analysis result for SHA-256 49476e66124166e2…

MALICIOUS

PDF

85.1 KB Created: 2021-07-03 04:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d41b5fb0260c8232c4e2289560798025 SHA-1: b01f634a132a6ba516a0445a22f1602a11f2bfd1 SHA-256: 49476e66124166e22a1808edf2697dbfd50c1dd5cc14cc54cb8c44ed270b3012
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the URLs and the detection names imply potential for further malicious activity, such as downloading second-stage payloads.

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 http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87b0986216---20092754451.pdf
    • http://nuraski.pl/wsg/userfiles/80449494098.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/1a85c53a8283c0214bfd9b1908d95efa/jigof.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160742c856d20d---rozipekine.pdf
    • http://zezoalza.com/ckupload/files/69782361921.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nd7gra86kr18ned4qoq4o8bd5n/darinozowedu.pdf
    • http://toicodonlyson.com/uploads/files/sipow.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/e7b39b02bd7dd4d824ba2a310c1efb3c/81854380190.pdf
    • https://nguyenthelong.net/userfiles/files/3472222264.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160837b4a4058b---41072163457.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087d0fb6c4df---xaxivaxepira.pdf
    • http://hongshengfish.com/uploadfiles/2021061412095465911.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/n5cv4aj4nuvu13n1bb4ohrng15/dadizarikinilik.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/0a3a2f94a336a492c713105b525528a6/jofinudolorogow.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903b052aad8---62770989317.pdf
    • http://healthywithhart.com/res/file/35314703992.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ce2a68053---boxaxalagesolezalowirinor.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/satidelukivupitedeviro.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/92689ea71d5b1af891c659f97589076e/nuket.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592b0e0d20---gokakosulafav.pdf
    • http://henghuitong.com/jingkelun/userfiles/files/20210701042349.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4926166cc7---91385899962.pdf
    • https://muzeumkonstancina.pl/attachments/file/47305531516.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/04847f2f0aea7c278daed3542b86927a/91211483087.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+slime+without+borax+recipe
    • 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_off0000e7cb.bin
73cbbbe5325de7eab58f70dfe8c24e6514ab7e98c11f0c575b7a0a9a5310a6b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 11048 bytes
font_01_sfnt_off00010153.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 16792 bytes
font_02_sfnt_off00011965.bin
47ea144a92c338947d34978772b82d2206318ddf5c17c517529c37471a977912
pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 17620 bytes