Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c4cb9e50d2f8cf…

MALICIOUS

PDF

102.1 KB Created: 2021-07-04 16:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 509f66b97fee92fa5a45e8f1af9650dc SHA-1: 7876c47a8743c69042f6cbc38619b93a8da39326 SHA-256: a0c4cb9e50d2f8cf9a6788bb1e164c9d082d9010483d5e5f59f0559bf1e62ad1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection indicate an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c94a4994ee3---85339351602.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd3f3ffa1---84658748112.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/27444242840.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/30484078358.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1608726fdd5524---39002966773.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607899ab17d65---63761158310.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4016c3e66---gabirepoxuxabudibu.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/futonidobowomitum.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/94875103768.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/71376984956.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/mexakuwukagorosojiz.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/96047759780.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/7ddhuh21lo68kqqe0s15953r30/87956187542.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c0fa7c94---tarufubikekawasidu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af32cca83d0---32681784135.pdfIn PDF document text
    • http://armanetti.com/images/rasexuzodofuwifunox.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/824960082.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/toropizuretezulelefi.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/4thur0laatu2cjjaats5scbhsn/36316077167.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2d534a703d2b9a033248e234877cdaba/dovajotexibugo.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/hn9jd9ump45vumfeagvosodaei/33145953994.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed4bb4a604---jifita.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a329a269927---5634542069.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/8381824600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gemini+twins+meaningPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013421.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13421 18960 bytes
SHA-256: 6bad0025b2b7bb688673c2a655bee91588b9d8511e341494c82257f09ae3feb2
font_00_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 10312 bytes
SHA-256: 8150361bdb48d60b79e0a42a44872c5e97c199389536a74507744aff16f35e77
font_01_sfnt_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_02_sfnt_off00011c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000153ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CE 22148 bytes
SHA-256: 2ee0d16e38d640c226390517e0433226cc56ea43de5157d9459b39caff1a8080

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