Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e310fe958869b83…

MALICIOUS

PDF

90.6 KB Created: 2021-09-01 21:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4dc3df52bc18495745e53edce0f9588 SHA-1: 9bd4c5ded4b7f4d70e6261aabb323ecad2ca663a SHA-256: 0e310fe958869b8346cea57a1708b622b3600490de99311bb2d7734ea9c61f0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to compromised websites and link farms, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://allytemp.ru/uplcv?utm_term=what+does+blessed+are+the+pure+in+heart+mean
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/r66rh6aljk89gscqk1ugkh6863/vexatililumivufibudir.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/2l8v9ajopscddbu2j62a9dk2mm/46382167448.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/28915f0b8615e8cb02b5ed5e061079aa/57843009084.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e26391cbb5c---37010626479.pdf
    • https://isosklo.cz./uploads/kifadesajovexevopuduv.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd9713f470---38607449309.pdf
    • http://onishi-kyosendo.jp/archive/vimozipo.pdf
    • http://www.peretprod.ro/content-images/file/68183891516.pdf
    • http://alexhofford.com/temp/files/file/11120414141.pdf
    • http://hamyarsanatco.com/ckfinder/userfiles/files/dazisizogufixuvizapu.pdf
    • http://hotelamadeustorino.com/userfiles/files/mumikikimemozuwufepasepa.pdf
    • http://riph.pl/userfiles/file/nejoji.pdf
    • http://pawsandtiaras.com/ckfinder/userfiles/files/tevazemejod.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d48eeb68492---93822901598.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a80cdb49ca319d1529bbbb809b155e8c/91796817667.pdf
    • http://automsystem.com/UploadFile/file/20210504135524005.pdf
    • https://www.abrasco.org.br/ckfinder/userfiles/files/tuvepogu.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6684612505---wafotigabi.pdf
    • https://rmp-familienanzeigen.de/cms/files/rimidezojamigiwazixu.pdf
    • http://mobilesamara.com/img/files/file/pesotomojafukigumubi.pdf
    • http://centromedicoveterinarioadda.com/userfiles/files/kilolutopajodabusamuroxe.pdf
    • http://sergeybazarov.ru/file/48958007777.pdf
    • http://geteffective.biz/uploadfiles/file/tavasiduzofosile.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161123e75c17c2---46385287245.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a492d0073---49708736426.pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/11510797619.pdf
    • 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_off0000fa90.bin
76340a06644f67a802ca801d6108ed5392d62c1dbb20b950e1321db8cd53e688
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 10892 bytes
font_01_sfnt_off00011347.bin
0fdc099caad11b7653e4da9c06ebca896fb3541d1fb1ff75d9d90b417cda4f0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 18884 bytes
font_02_sfnt_off0001433a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1433A 16792 bytes