Malicious PDF — malware analysis report

Static analysis result for SHA-256 c709932a8f82349f…

MALICIOUS

PDF

89.4 KB Created: 2021-06-27 16:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9486caaf0adb8e5b31d3c95248278835 SHA-1: a70d9011be83da0c93828cc6f20d48dad6904162 SHA-256: c709932a8f82349f8309c8a4ec792ec566525cc48e8bffdfbff74d317864a619
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised infrastructure suggests a broad, opportunistic attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d5a612b4a648d73cd590377bd94207c/1438540206.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/654784b264659f379c97b12ceb45cb62/dofifikavegevuteve.pdf
    • http://gld-lining.com/user_img/files/6371384770.pdf
    • http://brainbond.ro/userfiles/file/33114222655.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca01a16bc---vopogipapumeluwejupuve.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/53900503229.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6689b712782610476df8c4ff61b2c9e2/13015485550.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/969dbded6149235f65005a7858b58284/98160830969.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/gajunosanif.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0efe425d63---gikatew.pdf
    • http://tecsun-moscow.ru/docs/file/mukewap.pdf
    • https://tmtteks.com/files/28491939252.pdf
    • http://remont-elektro.eu/archiv/file/lubotugesonutolede.pdf
    • http://bezpiecznamlodosc.org/files/file/93577518147.pdf
    • https://bdsvieclam.com/upload/files/botarunixakapituxin.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tsq6sck00acgom52vv43s39abi/94827571874.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/c08b588308e89eff39020bb5c28ecea4/13744309484.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/sfu63s27o04dr6tgdlf5fu8iqo/donevixetusura.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074b3b40f4f2---84422479248.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608f99e6940e1---88494204072.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7d16c309---nobudowum.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/24d4a1f913116e80731c5b3d748e9ae8/wajorabadufogave.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f074179e18---polalisi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+is+considered+fast+fashion
    • 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_off0000f9be.bin
08960bb1e796a0035b525fd63e9b5308d196788a23184c48ceb345f0c5b21226
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 17952 bytes
font_01_sfnt_off0001286b.bin
45ad2e51e0f81e5dee06ec96ca43aa84ebb8752ea49794bd37ed7dcbe69c9b95
pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 10520 bytes
font_02_sfnt_off00014064.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14064 16792 bytes