Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d59e6c056c7161…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 05:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4d0c3250816b994f76aeb0e5fa13017 SHA-1: 6e11d1f9fc3ce7f63894e620a3bbb12a5ef1e31b SHA-256: 41d59e6c056c71618604493c491019e6b132427e982e5c878694060a909810e2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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
  • 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://topflexsports.com/uploads/82117269184.pdf
    • https://toocapen.com/files/14637706786.pdf
    • https://abzesolar.com/uploads/files/zunesexesipapuxilepita.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lodiranugo.pdf
    • https://tecnomatec.cl/upload/file/20956104159.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b8f01c47b9c2a41e48801042bf75e724/tegenulimep.pdf
    • http://palestraarkadia.it/userfiles/files/mimagorokeluveramimomepit.pdf
    • https://aimara-bg.com/userfiles/file/83898498928.pdf
    • https://inverpalmas.com/aym_image/files/57451415264.pdf
    • http://homeopathyhongkong.cn/files/putepunasizeberutaxinoge.pdf
    • http://cornucopiafrederick.com/uploads/files/vujazemokij.pdf
    • http://zjleiou.com/images/upload/File/taxotedamigevito.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/8809301852.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4cf8cd6c27b8e988a90cc79300101e7b/xenutanakaf.pdf
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/32434326572.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e651bfa0a2a43df71758f1ee265d1b33/zevizerobezolov.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/tikozadeguxewijepulamiz.pdf
    • http://biblioteka-belzec.pl/upload/files/lakaravokowu.pdf
    • https://elger.cz/fckphotos/file/44641461834.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613b73063bad0---xisabowokajo.pdf
    • http://maility.pl/_ADRESuserfiles/file/97815087514.pdf
    • http://ac-kenigsberg.ru/files/file/87952398145.pdf
    • https://kimcert.com/E/file/mefuparefowedawiw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=isaimini+movie+download+tamil
    • 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_off0000b1df.bin
a49f544afd276a913d9161aeeffbdf9c795687fbeea2673148449b3d45817e6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DF 10412 bytes
font_01_sfnt_off0000c97d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC97D 16792 bytes
font_02_sfnt_off0000e18f.bin
4697c0fce16b2caf82306d33e390939c66755c5f87379119912a23d456e14e9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 16992 bytes