Malicious PDF — malware analysis report

Static analysis result for SHA-256 7816a260f6ece054…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 17:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a80c4503f0531ac81f07e036d80e8069 SHA-1: 7a1e83d954fd13546d1d05a40f60b0d100347ca4 SHA-256: 7816a260f6ece0543c93fb84e5174ef0b071a0b13bf99cffe2fba90ddfa1c40a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. This suggests the document is likely used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://gamedunyasi.com/calisma2/files/uploads/95615052860.pdf
    • https://atphp.ch/userfiles/file/geremata.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608e436ec6142---suzunovivenagotawokusum.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210530212800.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11288e6da5---bikedipunipof.pdf
    • http://spalovnachemolak.sk/userfiles/file/xedegedavarevisakek.pdf
    • https://antae.be/app/webroot/uploads/file/91955484188.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17fa4f743---93444774159.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/72057ec8bdf86649c17c549ed64ce803/62571280118.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8075ed9d---14270234652.pdf
    • http://rund.cz/UserFiles/File/risewebojifijebiz.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5ad620303---21606043139.pdf
    • https://isabellepieman.com/userfiles/file/tarumatebax.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5g8gnb280h187e4ebnebr1mr33/30334517768.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a3aad3bf---sagetuvoleliwexidumegoron.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607790cf99719---dogewo.pdf
    • http://hnkingdee.cn/Files/file/2021523184715.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710442393e3---saboxafadapazanumekir.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607438a82d985---33107438012.pdf
    • http://christschoolblr.in/userfiles/file/90487633907.pdf
    • https://tkquiz.com/userfiles/file/82626911398.pdf
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/napatibafid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=year+of+commencement
    • 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_off0000ea78.bin
2bc7f0ec491f09dea0a5bfff2bb4cedc9d3b3440f5436005a6e1638a6d52970b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 10176 bytes
font_01_sfnt_off00010143.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 16792 bytes
font_02_sfnt_off00011955.bin
a457ee405543a582276791b59799da38bc5a163eebeadb8c4689bed0c925b13c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 17944 bytes