Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b38073d9d41c9e…

MALICIOUS

PDF

84.8 KB Created: 2021-07-20 20:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7f0d2aabd6744a1015ef5700aee7d35 SHA-1: 05eacf1c501ab2036d5a573ebb2d96f2608c1317 SHA-256: f7b38073d9d41c9edb2a467a2465aa4835ac47c297198f59b3f09f2a8ab17683
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document flagged by ClamAV as a phishing trojan. Static analysis revealed numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://mebco.ru/images/file/zejosuvofor.pdf
    • https://bloomlight.pl/_bloom/file/85073546049.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/571e3e50ab8e11832e3498646210a648/dudegisefajik.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9381a5a4---55038519446.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f6ca2dd12df2f55760ba31f5fb233857/junem.pdf
    • http://namadagaskare.ru/ckfinder/userfiles/files/27190430696.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/000fbf1fcada468b09cec67225f063e5/59755689666.pdf
    • https://starbox.fr/img/files/tidakebezeb.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c115dadd300---72048919698.pdf
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/48913566823.pdf
    • http://greenplanetnepal.com/userfiles/file/fojog.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a347645a55---nawulabipevizup.pdf
    • https://clubsportedinburgh.org/userfiles/files/41208172362.pdf
    • https://dnmpaint.com/sdcc/images/file/somadabazabekikukapukupe.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6255a271b---nugalizuxa.pdf
    • http://interno-kazan.ru/upload/files/todakugakidevidozofewi.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e875f20418---tosovugulevikazon.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b554bc7b904---zarotinuvigedunup.pdf
    • https://abugfreemind.com/userfiles/file/51800316829.pdf
    • http://htwy.com/upload/file/timijozo.pdf
    • https://tantecoccole016.it/file/mixodalowagedoxapumisisuw.pdf
    • https://cplastik.cz/data/cms/file/69044582971.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/868e2db5e243563732a5d2ed53388b69/xepupinotibuganuxatemi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=36+cm+to+mm
    • 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_off0000ea46.bin
2ebda68c3f019841384a09d96071c524f378380ab350182b9a5b071388c0203d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 17324 bytes
font_01_sfnt_off00011769.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11769 16792 bytes
font_02_sfnt_off00012f7f.bin
465262dc284b4d3586d8d062220efe3b620770eb07249f5fdf9ffbdfeac36a1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7F 9832 bytes