Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce886621f5b7111f…

MALICIOUS

PDF

85.0 KB Created: 2021-07-12 22:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc8ea27716826d573b8cf276ab172d60 SHA-1: c645c73ca6172253c421e8552eb55bf04cacb44b SHA-256: ce886621f5b7111f097436bb7e8503b33c1364de8fbb8d88ba9ebfbcebab6eed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver secondary payloads or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://timandlor.com/userfiles/file/lupivasunafoxin.pdf
    • http://tccsrl.org/userfiles/files/bawejovi.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a54482ee---bomub.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/jaluzomekediponotazomova.pdf
    • http://blesk-stroy.ru/userfiles/files/tisejeva.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f2b79398de975b6fe8367ef1698245ac/12239817494.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caeb4d3c0a---96009740543.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/ee3e978177c84b5600d42a0c52908bad/14648066045.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab255c8d4e---kuxonibirofirutaviripuk.pdf
    • http://cbafjvn.com/uploads/userfiles/file/51503625449.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5283db892---54669830634.pdf
    • http://dermatologomiguelgallego.com/miguel/fck/file/bofawexopupi.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e2621431---rozokobawijuradijugotidib.pdf
    • http://2ds-creations.fr/userfiles/file/44038495871.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcde2b3fcb---93285548602.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/5416757022.pdf
    • http://grafiport.com/userfiles/file/siwozawubudar.pdf
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/vudigobekabevulixekiv.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27416cd994---36852758700.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/1695e1d62c68c87ca92f182eb9a92eec/rivafixiwirikelufojev.pdf
    • https://aartipalette.com/userfiles/file/85392164358.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/v757jk6b5kqvnpj30trkoit37o/13446251826.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076109da72a1---biwanufifunetaw.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/xedep.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+mind+is+without+fear+by+rabindranath+tagore
    • 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_off0000e7ce.bin
38d11f07b97facc79e612937a606011d478cdc829fd05ccd488e198417227e4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 11160 bytes
font_01_sfnt_off00010191.bin
c9dd4d3fdcc17c8bb99c6b6ebecc90885934c7cc783784657503119379df3749
pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 17232 bytes
font_02_sfnt_off00012e44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E44 16792 bytes