Malicious PDF — malware analysis report

Static analysis result for SHA-256 42be85fb5d2a6b04…

MALICIOUS

PDF

86.0 KB Created: 2021-07-08 03:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 045a9590824cc221d45c8d7a96881fde SHA-1: 4c3f55edabd97bcf52bf6e6681b6645a51451faf SHA-256: 42be85fb5d2a6b0405a25ace5eddb4ddc2d3999d6fa1fe2b0d3d9db36bdc0aab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URLs point to a common phishing or downloader pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=must+you+be+baptized+to+go+to+heaven
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ef0d36c97---lunemaniwegisenaviwotafem.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/phff7o6pjme4l9ve5v3sdgq3cv/10079769444.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/45717650854.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e0167fc198047d7c0c06ecd5d359e83f/sononofetunuzipe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722b9dea4ae---pekivodokanerituxus.pdf
    • http://kojeneckezbozi.eu/userfiles/file/34820411788.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b7a2ce989---norogaxakitabeguxa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74f13f12e3---37276392621.pdf
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/rolutafebida.pdf
    • https://volgogradexpo.ru/ckfinder/userfiles/files/48820940164.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210701152532.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3c5e38b574f39cfdd41c17dcd05f51f6/65054040239.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/39a8e33fc1abfad912c86b6470815512/finuzavex.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072104cd6df6---40460273709.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f21fc76e2---rodaxuli.pdf
    • http://rheumatology.institute/upload/content/file/88857782333.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4e325516712b97892b73b85eb71124cb/muposulojorogogijovur.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/minapara.pdf
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/4m9aab980b1oouhsnt2ldi0gjh/45537305233.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b3e7e62c---mololakapev.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/hbt7hn9o616mkbla23bgcs7fci/75846083517.pdf
    • http://ridendo.cz/files/file/pobiz.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_off0000edee.bin
0a1a43c633c51c597135c49123494d1b24e19561e43815cc55be8bbba09e2e62
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 10996 bytes
font_01_sfnt_off00010724.bin
3557a2e15b68c1873cd03816b0450507bda460771decc0758f45666667266ee8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 16720 bytes
font_02_sfnt_off0001326c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1326C 16792 bytes