Malicious PDF — malware analysis report

Static analysis result for SHA-256 2542bc5bd09d3556…

MALICIOUS

PDF

62.4 KB Created: 2021-09-18 20:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3eb47a2de221bf888debee6beffdf85e SHA-1: d88b16a0eb6c95836ca24005a6914ecd6ea46b65 SHA-256: 2542bc5bd09d3556ba82c31c02f423a3e11fd6e1430c1ca60af18783458aa49e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, and it employs an image lure technique. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URIs and the overall structure strongly indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 62 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://queure.ru/uplcv?utm_term=need+for+speed+most+wanted+2005+apk+download+for+android
    • http://ohxto.com/uploaded_files/userfiles/files/64279771481.pdf
    • http://superfishinglewood.com/uploads/files/79340813534.pdf
    • http://jj-metals.com/userfiles/file/2021090716451373499.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8e4tkdc0c06pf397vnouq9omgm/18519521312.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d95b8400---nifajuzemekawubuvabod.pdf
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/17207818306.pdf
    • https://adrfarysz.pl/userfiles/file/1279274460.pdf
    • http://sys-svinding.dk/userfiles/file/fireluverixezukuxikunoju.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76732f18d---zafifakusetixazujajane.pdf
    • http://kxqcgs.com/filespath/files/20210906124940.pdf
    • https://kaparatt.com/images/File/gavaz.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/11997ff97f3f58771f3da0eb08df2eda/53617863532.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6267a70d---88685443888.pdf
    • http://gaudi.tw/upload/files/35463597804.pdf
    • https://ooo-kenk.ru/userfiles/file/wefupisaxavefukitafanelil.pdf
    • http://rasmesafar.net/basefile/basefiles/86305329874.pdf
    • http://arenabilardo.com/data/_files/gewitevisigowi.pdf
    • http://seattlebestteriyaki.com/uploads/files/towurepizomidanupuvege.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614175019831b---49919492189.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8pavnphc2d8e01skhjjs6dm2t6/2675872373.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/vizagafepurajojariz.pdf
    • http://synowka.pl/galeria/file/91862229731.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3c84d827---42923494063.pdf
    • https://km2804.com/ckupload/files/bevixe.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A8 16792 bytes
font_01_sfnt_off0000cbba.bin
0c097156fc07bb3b013ec21c55789ec2b1f7184fe4efefcf8e887819ed742702
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBA 14232 bytes