Malicious PDF — malware analysis report

Static analysis result for SHA-256 1974ea29dca11105…

MALICIOUS

PDF

106.1 KB Created: 2021-06-26 05:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69d6647fad3307f63262b4365d3470be SHA-1: b99871f860d9caa2d3ee0d4daa64503cc7a3104c SHA-256: 1974ea29dca1110532ebeb98700aafea84dabcb9f05aa0725517c84f1ffce16d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files, many hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://golden-candies.ru/webroot/files/files/gasevuwizigefub.pdf
    • https://orrizon.ru/images/file/53089743642.pdf
    • http://gptools.net/userfiles/file/41972384636.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/1538d14478812f65381d3a59c764abf7/8365290225.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/936ad9591063c57e73a7652aca22c9d9/pajolegovotepatotizipez.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c3598a773---viniguvuze.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609637fdea0d6---47691134572.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160911787db284---siranelodixam.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/9dlehmls4c7mcs71qi6d64a106/nonulivobuxavidomupeka.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b57a19361aa---34198549453.pdf
    • http://sattosushi.com/uploads/files/vemuwixepisegutazuwo.pdf
    • http://wittlich-luexem.de/userfiles/file/3313456649.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ceeqqf5fvog2ld81l18d8b7uf6/66237300426.pdf
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/vigebiwumomu.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/jm72rb3l18j05ol6fqf8qmng56/13501060121.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ga5lg48594qsbmn9sp3tm9pigb/22450833597.pdf
    • http://buddhavehicle.com/userfiles/file/42320893582.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/xujiritagalagaweba.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160824e14358e2---zupinotunaguweva.pdf
    • http://fecirturizm.com/resimler/files/79157906689.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd03f9930d---rudikoruxelemitepuwejego.pdf
    • https://dukra.sk/editor_uploads/files/fivanizo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=in+minecraft+how+do+you+tame+a+llama
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D81 16792 bytes
font_01_sfnt_off00013592.bin
2777f69b2d24fdda34b9239a75f377880adec0a7ea532aee76f4edaf792718d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13592 19208 bytes
font_02_sfnt_off00015537.bin
007bc6cab23735f19dbe13843fc27f2e91ca79413ce6596878bf22348963fa5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15537 17152 bytes
font_03_sfnt_off000181d3.bin
a1435a0b333cf16f480b90039268a8c5c560a03b479ef503af5d324c6a720f10
pdf-font-stream PDF embedded font (sfnt) at offset 0x181D3 10824 bytes