Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40facdbc2263cb0…

MALICIOUS

PDF

83.5 KB Created: 2021-07-12 22:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3179fb091f354c7f0f2446f8cfaeba1c SHA-1: b027fc2d50527bdf8f9dce7242590dfa1b54081f SHA-256: d40facdbc2263cb099cac195646cbd62ab7a1b0c526e0430dc5c3c8792301f9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbf56f0cfa---vekutufufazimomam.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdd25b7295---botuxizu.pdf
    • http://sgyscom.com/upload_fck/file/2021-6-10/20210610125259457930.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/ba33a1732faf2086cda39ecc46adfd33/dawemawezuzid.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075aec327719---lejoxizepidajad.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c590b0c46c5---tujewojoludezobanola.pdf
    • https://mattress-leader.com/media/6867875314.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/rbfndh8l9fe4o52is1kq6bpnf4/felitidudux.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/62477187435.pdf
    • http://dgjst.com/upfile/file/raraveralifurivu.pdf
    • http://denis-lefebvre-services.com/fichiers/file/dabojin.pdf
    • https://floridainvestment.cz/files/file/sozatifobotedut.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf302dd193c---82999982764.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ab5ee02a8585e187e85849e8d25944a2/58812361709.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3743426f0---rugovepiwitukupapolenomu.pdf
    • http://americansemitruckparts.com/d/files/81531335280.pdf
    • http://billedbutikken.dk/articlefiles/file/laforonupegilunesu.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/f241748b459696bdc49aef66a402da9f/purinitarutixomin.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4d3296dc---99553262298.pdf
    • https://cortemadera.com/wysiwygfiles/file/16959331896.pdf
    • http://mywayrtk.info/userfiles/file/sijuxagoj.pdf
    • https://ive-cal.it/file/matele.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bfd55ed86f9c5e54e95657b9ef07d5df/folodafomeveseka.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/71238433090.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/15e70fff9840745e06d9b093d5165620/2641135466.pdf
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/deneja.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=solution+manual+of+fluid+mechanics+by+munson
    • 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_off0000e0a8.bin
b4dbb5316905a5cf9921393b221ac98e07452fa06269a61af9e107fe76c62d23
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 17884 bytes
font_01_sfnt_off00010ed4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 16792 bytes
font_02_sfnt_off000126eb.bin
3ed2b4c387bea4ade97c34a52169ea9cce263fa89a02b54e20870a1d28c0768a
pdf-font-stream PDF embedded font (sfnt) at offset 0x126EB 11068 bytes