Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5eef92b092f6dbc…

MALICIOUS

PDF

77.0 KB Created: 2021-07-07 05:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12f497e031cee610202b29876b6c5bef SHA-1: 4cdb01c932954f52e4a6a1aaa0c8051e4d39483b SHA-256: f5eef92b092f6dbc9131267ebee736ea632d81eb05637078b2b2fbabaffbabc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • 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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160733220df687---memasiwavabezigasok.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce585b030c0ca0d42a4eec917bd84d4a/ruzif.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/ade35484352f8d3e3d7c8e6452e9ad30/32730834122.pdf
    • https://osiindia.org/ckfinder/userfiles/files/1220699363.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc6b1a7a7c---5816136216.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609371ab84b6e---bekivodozikaxu.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/lulolufemexijefivixijawo.pdf
    • https://milsagliksen.org/upload/ckfinder/files/mifoselitenefupeto.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e0433ce5678---70802802035.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/bac69906a6ddfe98f6bf7e0604b9f129/pinovasemo.pdf
    • https://bnbcostaverde.it/userfiles/file/28742409126.pdf
    • http://linza-market.ru/upload/files/89407523528.pdf
    • https://beatmuellerfoto.ch/userfiles/files/pobisaxigujoxisefekinetu.pdf
    • http://www.asslar.de/downloads/60007456518.pdf
    • http://toonesk.com/upload/soxemew.pdf
    • http://livingkaneohe.com/userimages/xegazenewoxewurarogew.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/0obkfn9ljslg21kk1rg8apejke/26461737378.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/n1j2kmild98fu9e95q91urvvm9/45649357231.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/zejukekefovaselejokozi.pdf
    • https://zulapin.com/calisma2/files/uploads/18091862457.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc17cc36d---xejetisijegawagita.pdf
    • https://aarhuskortet.dk/images/file/xerovugakitiki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=power+electronics+gate+solved+problems+pdf
    • 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_off0000c470.bin
1bece9855b095a1743fb2e193458d54e3f551e888752b8adb23686c8d926f67c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC470 18104 bytes
font_01_sfnt_off0000f4a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 16792 bytes
font_02_sfnt_off00010cbe.bin
215f80c5fe198c578fbd9cb38b128e284c8fb9aba9c401e010de8f28da11b730
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 11256 bytes