Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8affc62b3a141d8…

MALICIOUS

PDF

89.8 KB Created: 2021-07-19 01:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 504d8498bee7a249546c1ea98b833642 SHA-1: 3e32b525190fef85b5c6e267902e1f1139dabb22 SHA-256: a8affc62b3a141d8b7da62c3370153091978ce28013df3c7f3140d9fcc05cb8b
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of brand-impersonation credential phishing. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, with one specific URL impersonating Facebook. The document body is heavily obfuscated, but the presence of embedded URLs and the phishing lure strongly suggest an attempt to trick users into clicking malicious links, likely to download further malware or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=adobe+photoshop+for+android+mod+apk+free+download.
  • 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://rioairporttransfer.com/ckfinder/userfiles/files/japabinaguni.pdf In PDF document text
    • http://galettedesrois.hu/userfiles/file/bozasukogijuziwarikifulum.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/nc7615f35r152u2m94m4i5oafu/jikonag.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607906538f89b---40900826470.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ede754a30d---wuninutikunosesidudu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2tm9tc114cudu17f9h0srti4m/tazumukexinuwulivulusosip.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/mutul.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090283b3a98a---donogeg.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ff9895624---temas.pdfIn PDF document text
    • https://abeess.com/userfiles/file/bibajo.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/92413129794.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/wuvepesofu.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/86925922047.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/sozaze.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982218e0bd9---kalusowexabogixotuniz.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608654e0daf13---78917308376.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aff49ea99e9---rozujoxenumafulixajog.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/rosomububixe.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/80215469869.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021071602585873499.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/titabejelulojisajerurak.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/62021648734.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/bisubir.pdfIn PDF document text
    • https://plasy.com/uploads/file/27989712076.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e632079def---10023723195.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/vatofopiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=adobe+photoshop+for+android+mod+apk+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 18348 bytes
SHA-256: 704087a889f2527c754b021201296f1475cb34b712dc8a3c945d57982aaf766c
font_01_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001401a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401A 11064 bytes
SHA-256: 318177521c50210ead2576b3ddfa7cc0577e05a651fe96743e1e1f8746004e16

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