Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fc0f757cceb39d…

MALICIOUS

PDF

94.4 KB Created: 2021-06-25 13:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34673c9ff8160a450f64197157849148 SHA-1: 7013a6ca2ff2e7c48b1c016006ba95eee15e18ff SHA-256: b3fc0f757cceb39d0fd40284be9130f92614a76c344cccd9a422793ca4e49236
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the link farm and potential tracking/phishing nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/kowatesulaw.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/5bcfa86cf8e9c06cd598ce0b4591da7d/26549367931.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c640edaeb8f---piruwevopedowiwisiliga.pdf
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/m4dra6o20ekh4hi38qcfkupmbm/melepojawexelasofanito.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/9be3fa0135865962997235ef44745b02/gajipazane.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82e59e3a2c---55165991419.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd5d89fe7a---79738881959.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6684612505---wafotigabi.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/a70e2af11241d7c42a50a45d77dbee0e/78168420257.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607868e52886a---midipumezikusolunu.pdf
    • http://nktrading.qa/file/files/80131667667.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a62b8524ffbcac60c395cbc019b9f14b/38544648607.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076e257d0d3d---wawamilafuxu.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9383bf7eb49dccfdcfa70a58f9feb34b/18890996008.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b032eccbe28---pafegizarajigodusug.pdf
    • http://tnslib.net/userfiles/files/bipefevam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bloons+unblocked+5
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/35219fee0c8566b71591f3b659dbb21d/zixuxumiwonodul.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE74E 16792 bytes
font_01_sfnt_off0000ff60.bin
0e1692ab8f39e1099a6185eb322a1b53d09a82f8c832707d9eebe7cb72ad99b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF60 17912 bytes
font_02_sfnt_off00012d36.bin
de815fc77488bf99e0f7a09017923fabc887c5239334538f7a9e148366f78408
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D36 12168 bytes
font_03_sfnt_off000154f1.bin
d8a78c984df93793f487bd5bbe7b31bd4dfa07575f46ded8240448db7558ffb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x154F1 10432 bytes