Malicious PDF — malware analysis report

Static analysis result for SHA-256 2447c4d50fba5106…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 22:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1144515457dfb139b7c354c30f9eff89 SHA-1: cd608a671b6dd59d60128be9b13f68083b281aea SHA-256: 2447c4d50fba51062b20364a34fbdfc76b42ffb51481d7a840bbd8195120a208
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to deliver a malicious payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=fts+17+mod+apk PDF link annotation
    • http://rudolphalexander.com/uploads/files/86414696320.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161453ff9b3367---bovezoduzixifibusuj.pdfIn PDF document text
    • http://asfalon.com/__files/file/lotadefesikafage.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/255717313.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4396ba988b1273ad90e998115777590d/dulusilari.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/bajapisisa.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/19343276752.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/52444673676.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/35771951250.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090504571573499.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/52384126563.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/14300811236.pdfIn PDF document text
    • https://il-gusto.com/images/file/moboligobo.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/64787934307.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/130234320613baf0b195c1.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/takoz.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/56707097328.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/85213381988.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/xizukesinokanuwuzumogo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0d00b5252d2067dc59b3a8fafb156fc6/paxegepedikotezaguxoxaf.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/41044884339.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/ripekudimiwozuxinivibonin.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/fopuze.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/nibobanezo.pdfIn PDF document text
    • 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_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 18340 bytes
SHA-256: 087b1541dbd61c05e54d85af6732a4509e8fd512b196b28d88a36afd7462bdba
font_01_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 10248 bytes
SHA-256: c5a40704f62af85ba20e6a5d4f63831612c5662ab91e1be56c8518ceb1c52a42
font_02_sfnt_off0001252b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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