Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3b29b5cb3f3a33…

MALICIOUS

PDF

70.8 KB Created: 2021-09-01 22:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0a506fe7a269e0b51d9e8bb64dbfe203 SHA-1: f686e608029f03beac60fbb7fb23ce3d787b792c SHA-256: ca3b29b5cb3f3a33588201fbcb0c2e07251da342ab0a5fd976ab0834b437695a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. While no executable scripts were extracted, the presence of embedded URLs and the heuristic firings indicate an attempt to redirect users to potentially malicious sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/oia7r07v25mf5bt9fashqhju24/55991586222.pdf In PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f083a7beed---vumelegulatom.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1626355170.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/98789514376.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/59792652807.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b143fd822e---37746294042.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/15c4e837cba6fa5f28484bd8dabe7d14/wadukiderugowujegadidaw.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/bojudetodezilob.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f86a7f907b76aa87cad26b4342696612/fosubax.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/54506547441.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/suzukafuvezisabibo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/70a32712a7b581de7067f99dfd7f6dce/31381816806.pdfIn PDF document text
    • https://sharenkon.com/files/givodabituvavobixixifuji.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ee496e985084941814b6df056d81eb70/77256372826.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8d037e1ee---sisuludoguxufakogoxesel.pdfIn PDF document text
    • http://capital96.com/userfiles/file/ledogin.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/34509359498.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/883bk1nra6subngm2r6sioq3to/58226387542.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3fa986636---jopiruxa.pdfIn PDF document text
    • http://jiab.net/userData/board/file/gafadozejugowaninof.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/xigopobubojarimegepabiko.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4ed918336---luroxanupuzelugor.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/24003292800.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/bodavazipodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=class+7+maths+chapter+6+worksheet+with+answersPDF link annotation
    • 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_off0000b5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C0 15184 bytes
SHA-256: ed3e48416fed3e7aa86c04ed961c54d9e391961c9fd505004b76c126848149b9
font_01_sfnt_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 11068 bytes
SHA-256: fb357630504652e6bd3709abe54baff0de97c6ec61fca200a0e38da2512eaf76
font_02_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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