Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18fbee48e1e5693…

MALICIOUS

PDF

82.6 KB Created: 2021-06-30 23:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f47699ae59b3cfdcf6379809c2e1b2a SHA-1: 191bea030fc7dabe56df4b4169ac14d3ce02a342 SHA-256: e18fbee48e1e569380d74310de451d522f7982a8e1fbe9732c8d4522709325cf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a callback lure, instructing the user to call a phone number for issues related to billing or refunds, which is a common tactic for tech-support scams and callback phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous embedded URLs pointing to compromised CMS uploads and link farms suggests the document is designed to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/2dc6fa277d9e84bbc4e194851e57fc72/gonididakezeku.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ceec7eb0bc2---dejupukawanus.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d901181fcaccefb87c6155dfc113e9a3/76927873054.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/35001508419.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/11374394329.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/b2a3d6675e106b28fec09568add32915/65239068904.pdf
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/12895801299.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/k6vabo0nc0ns6d7v267j17neko/jamoliro.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c19a8132b---3112264728.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c1d5e6a9---vusulatiwigusakidisano.pdf
    • http://www.kymkarajok.net/tiedostot/files/wuwirubibulipopara.pdf
    • http://peaceinsrilanka.lk/userfiles/file/28060959971.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b66fa74b7---76400321386.pdf
    • http://iphysiology.ru/upload/48686445962.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901d3cb3ceb---nawiwulaxejisagi.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/ccfa1d7113302080eab9ebda2e4c1fc0/dotomodemubeziwexovaji.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960bf207ad3---xejurotanabewelenudu.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/02caf44e4c8077ce514f323837432f0d/66017064040.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160815612b743f---jefewedaforavak.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ugq1rj7cirnn39dmj2l3lc0utn/26019408251.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fca55948cf---sowozelati.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/efe55203f46ae7979bec738d6d580c5c/gekutax.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/051bb09ed004ed11eb3387946eb463b2/50174427219.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=nitro+pro+8+serial+number+list
    • 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_off0000c9b1.bin
2254fc0b54b9064cef058624c8feff92cf1964c199f5ebaf2c7cf2ccbeb3b045		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 17208 bytes
font_01_sfnt_off0000e28a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 16792 bytes
font_02_sfnt_off0000faa1.bin
6299868d278093937f85a0eda5e5b74dc610d16fc9e7ad50f2bc5c0c1d27dbeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 10836 bytes
font_03_sfnt_off00011369.bin
bf59b90e9c8bb8fdcf542aa6bfd4bf33f4da824f07a3fb99956c4bfe0d0e9f9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 16024 bytes

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