Malicious PDF — malware analysis report

Static analysis result for SHA-256 68372a0391aa06a1…

MALICIOUS

PDF

73.6 KB Created: 2021-09-29 13:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4121fe77fa13628153eaad602ba2900f SHA-1: 24bb6e11e7a1acd9fe02b9527a28853225ed46a2 SHA-256: 68372a0391aa06a18e8ca48811420cebd300695ea909b270c4ac396868f2fae4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://kalashad.com/userfiles/file/lumisomojujukiwubisuviwa.pdf
    • http://archi-m.ru/userfiles/file/nidesomegepetixezefozopo.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/labisusunedepevuko.pdf
    • http://stphilomenaonline.org/userfiles/file/rovetufepoferugor.pdf
    • https://megalightgroup.lv/uploads/files/nofodegiridu.pdf
    • https://bedandbreakfastchia.it/userfiles/file/dozasu.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141e10aad831---zijegavisopabomamitojon.pdf
    • http://falconltd.pl/cache/file/45178248723.pdf
    • http://indemo.pl/Image/files/41619478726.pdf
    • https://mashtalkandil.com/userfiles/file/jomosirowebepu.pdf
    • http://dzirerealtors.com/uploads/41079905971.pdf
    • http://studiotecnicomancini.eu/userfiles/files/gapixotixit.pdf
    • https://namhunglogistic.vn/site/files/maboxojavitotifuzumo.pdf
    • https://botroul.be/uploads/29113818129.pdf
    • http://dienlanhlongan.com/upload/files/jilunurufabeludulola.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e987a958af---jukonuz.pdf
    • https://investkwik.com/userfiles/file/30480244969.pdf
    • http://klawiatury-foliowe.pl/_data/file/90729968304.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/pn7ipimcrhpdekett2rbnvbk91/jufuluzoresigifakujikawo.pdf
    • https://drosamahetta.com/userfiles/file/nibodigoleropa.pdf
    • https://zilalcooling.com/other_files/File/mukibejuwegiropobapuw.pdf
    • https://jiu-hang.com/upfiles/editor/files/zipujones.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/48235137027.pdf
    • http://vinhthuan.vn/upload/files/kumikalujona.pdf
    • https://dakhoathienhoa.net/images/files/15312928059.pdf
    • https://cauthinh.com/luutru/files/66207881145.pdf
    • http://consol.hu/images/uploadedimages/file/3643496505.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=iphone+usb+tethering+windows+7
    • 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_off0000b817.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB817 16792 bytes
font_01_sfnt_off0000d029.bin
8a91832c889b29852cd635f99afa0539d0eac4c66a3a98094fb5e3b544a81d3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD029 19180 bytes
font_02_sfnt_off0001001c.bin
36dec96479be4ef3bb8ae624b69cbfe64c0640730771f0090031522d0b3896f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 10792 bytes