Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a726277b6390481…

MALICIOUS

PDF

105.5 KB Created: 2021-07-14 09:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 63d4a64397fb162503291a13fe0a2c6f SHA-1: 69968121e3c9bea3032cca7dd998633a32c10a2e SHA-256: 4a726277b639048131de3a8a1bd5c914c33be8ec03d2af9e822ac99340af39d9
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The sample leverages compromised CMS upload directories to host further PDF files, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608afbcb1c097---68095687414.pdf In PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc6411274---zadopiridijovava.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/rupifusiroxeluf.pdfIn PDF document text
    • http://yuha.be/_files/file/lesizafilenaxozuleso.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/8998160886.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/gumogatanop.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/laganazaxaf.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160847dfe76171---70119968537.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/66583143077.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f22f6c4a0---luxapifinakokupa.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/6js4guvnt4iddq49rpcopocvo6/sumenezewumopejugivigu.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/41414546929.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094859916401---86133554907.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8b825ba93---tigewuk.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/94e9f6cd9e4e630abedc8b7d0c3f1ee7/12258226823.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a445026a0c4---vufadifinidulupazerojize.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/wosakegif.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/u8e5v39gh4cfjtlm30e188v9u2/85791527398.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/delot.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac275c296b1---89737877468.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a998ba7f67593ab88963a460b3f07dd0/ririviv.pdfIn PDF document text
    • http://93564497.com/userfiles/94869241205.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/34077369445.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4f51bdbd5c2cbd8037d7c45e2bf3ecbe/vinefojijode.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efb1c0d420f86851ba29a9b7fb588763/2512902286.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/23119848613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=oocysts+in+catsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE8 19888 bytes
SHA-256: 97bd151a691328cc0abe6e7901a4748c53f5a400356e54b86baa9a6362485cac
font_02_sfnt_off0001824e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1824E 10084 bytes
SHA-256: bed10dc9ea96406b21e875b352c88d1b8af0b6f43777d8c4f34b280ad519a2ba

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