Malicious PDF — malware analysis report

Static analysis result for SHA-256 d601b3bf50aafcef…

MALICIOUS

PDF

94.6 KB Created: 2021-07-01 00:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b583c3d52446cc980571f653bef579ec SHA-1: 1deaa6503205cbe0dcc89e467214571b5ed422d6 SHA-256: d601b3bf50aafcefd6cbf40a2fbe13c5691a0e405761c634e305a7e6ea97afca
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised CMS uploads, with numerous links pointing to disposable domains. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • 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.
  • 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.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160980e4bd6b81---13164949652.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/xeguvugixijo.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/667fd70c8272b085b8d20b89792731c0/fonikerutigi.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/462f62ffc5286a7228c9028272ccf596/bilofimufa.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160785c12dd90a---madobafuderumizubewutavaz.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3136535da---97443241109.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be7f76b79c---puwak.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a910ee3965d---makaleruzexofakutakeje.pdf
    • https://kurtoglumob.com/upload/file/bodutifuwuzoriwiwupiwa.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a184fb5d6c1---12638726028.pdf
    • http://normel.org/files/upload/file/44158912880.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a61b19d629e---63103112359.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/171814b430d43f81e07f7bcfd223ccb1/paranolezivaxepoja.pdf
    • https://tranduongauto.com/app/webroot/files/images/pages/files/19328278415.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0d696aec1---wawawijevud.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d153f63e7a---nokutuvupinetij.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6h68k50fti2htnuubls8p73jn4/74561826450.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/907644218d1ef505aeb69f604713987d/66068575084.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec6fa29185---21251910354.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/tan44ck0qq2qcjf6j79fe654d7/dijov.pdf
    • http://mintaialuminum.com/d/files/22700153783.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/pdkauaq3hfnvl4vaegafrpilor/zalapomifaxuwopugimo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=meaning+of+obtrusive
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015437.bin
73717c105f0767567940b6d46c1511a1507931f9873c43120c54ac26bb14c30c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15437 16772 bytes
font_00_sfnt_off0000dd93.bin
0598fd4ace75101c45ac3e9799f83289801cec3ccb0f13f360ab8bda53aef58f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 10644 bytes
font_01_sfnt_off0000f618.bin
24f1caab77a38c25338338085f1f02f4a66e468b2fe40455912c222692df72c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 2936 bytes
font_02_sfnt_off00010265.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 16792 bytes
font_03_sfnt_off00011a77.bin
8bb14af8d95bff71454aea8c6ce0d567795489704768312fe77d5f3be61ecaf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A77 22252 bytes

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