Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3af1af13fca1293…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 10:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67882266670540ec38a7311a4552884b SHA-1: 4c7b1e05afddd54bbb3983d5eb1507bbb21e1eff SHA-256: f3af1af13fca129392764b300908255d6c6c329f2bed2a22150c64b92f814a20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, indicating a potential for malicious scripting execution. The file also functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of embedded JavaScript and numerous external links suggests an attempt to execute malicious code or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gruppopolidori.com/upload/image/file/13822628520.pdf
    • https://eastoncn.housemember.com/uploads/files/17847694119.pdf
    • http://russkiivopros.com/images/FCKeditor/file/pidatuzilores.pdf
    • https://iringmalaysia.com/ckfinder/userfiles/files/717471961.pdf
    • https://lecormier-menuiserie.com/www/upload/files/53943818807.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/02436cb7cd80198ef090c1bbd136a94a/zisolidabupufidagekuraze.pdf
    • http://csc-0411.com/userfiles/file/20210907150046_na5gy6.pdf
    • http://lnyuanzong.com/uploads/files/20210914135433.pdf
    • http://bienbao.org/uploads/files/safokabadasobutegiwomev.pdf
    • http://azco.friend-match.com/upload/files/28361737401.pdf
    • https://unitytradecapital.com/ckfinder/userfiles/files/nabumibobibezuke.pdf
    • https://reha.bg/content/upload/file/xogikedemumexat.pdf
    • http://hiroshima-teishaku.com/userfiles/file/mugadatitusibew.pdf
    • https://arabadvertise.com/userfiles/files/fupoxokewixadosinofit.pdf
    • http://ristorantebiscione.com/userfiles/files/53322603511.pdf
    • http://all-vehicle.net/js/upload/files/ziwigezatubolezugopoxuk.pdf
    • http://electronicaindex.nl/images/uploads/1298985828.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/7663920841.pdf
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/lafukapuzejopafekukota.pdf
    • https://profession-your-dr.com/uploads/files/202109090527039979.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e68d55cb0---robikujemesigokizunozoj.pdf
    • https://windfreeklima.com/upload/ckfinder/files/25103553959.pdf
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/sovuf.pdf
    • http://synergyproperty.com/images/files/nefojimore.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bsg12kpoqhn1c425rsq0h3j865/69701491973.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=simcity+buildit+latest+version
    • 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_off0000b979.bin
1496435a14195c45fd7729765ce72809c1c04e0b01fcdabcc5e1b1c7888284be
pdf-font-stream PDF embedded font (sfnt) at offset 0xB979 16564 bytes
font_01_sfnt_off0000e372.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 16792 bytes
font_02_sfnt_off0000fb89.bin
d91fd590448a5d438b25ece813c6fd2d3c3c4d3909cc9721411dbfe7c46ffbe4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 11024 bytes