Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafe7f36093d0b81…

MALICIOUS

PDF

77.5 KB Created: 2021-05-04 00:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c1736839df1799fc3540dd95c612ff4 SHA-1: 5bb49158607c507059632714fe2975237f315892 SHA-256: bafe7f36093d0b814e28ab097f764f16712353e9983058b3e533981cb857ef76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7815

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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbae2db6e0---28364303998.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/fac1e0a983661dbc961e7da845568419/mutij.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebce43151f---8608680429.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/geq9hgqethf444tnpbv8tem5v6/75784109420.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/8pt9j3f5onkjp99ldaf16kuuej/67934114261.pdf
    • http://africa-emergence2019.com/userfiles/file/98776421598.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/85a0b6385f79233bc348fb7d51f87111/korijisoz.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe23ee45e---bemuf.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608674cae6773---72608557162.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/df3e53e9f30a0e5aafc9b6bd100283f5/lirevawobegudafe.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607916cdb23a0---13724418568.pdf
    • http://abpaluso.com/upload/file/96115259346.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/aie62tbuocgg3b0i4kccou72j3/xitamatovujixagujofirop.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7e5f07372---50949569148.pdf
    • https://ludifrance.fr/userfiles/file/sivovuxijazujog.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6f672533463449dc24fa771f90cdb7ac/tufefu.pdf
    • http://lapenya.cat/imgjovesnaves/file/4611880201.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77fbc1c38---46681089142.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=crossfire+ph+manual+patch+forum
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db7e.bin
7e4b914aa430f05dc2ab9ba280b98f0aa04cf24bd481a6b1c297ca1312da7fd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 5160 bytes
font_01_sfnt_off0000ecd5.bin
8ab923703a6cb8420f8fca7bd3ad5728ba4bd58dd88d5cf9a7680080d3c28edf
pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 1908 bytes
font_02_sfnt_off0000f625.bin
6e3d83997ea455e7e21fa36aea3c17db0852bf73625878e9ef7955c168eb7cc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 10772 bytes
font_03_sfnt_off00011b58.bin
7f533b145a1586ca8426e4976b7c7e37026e0147da272070fcf94fbb11a7729c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B58 16332 bytes