Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6adf0fc98a9c58…

MALICIOUS

PDF

96.9 KB Created: 2021-07-16 23:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c4bae48aceb4d7b46f748d60e9e2b9d SHA-1: a63909d8de38a417808c2c212e783ef18984f18b SHA-256: 1c6adf0fc98a9c584b9c925ef186b8fa99d67e70050ab8f1e2112238e494bdc5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable, but the presence of link farms and compromised hosting is sufficient to classify this as a malicious link distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

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://asfus.net/virgsurv/userfiles/file/1417375397.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2tcck2n0177tmuvt9413nsfmp1/49671682454.pdf
    • http://blueyee.com/upload/file/120148509741.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e89ec2850---11010798700.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7d34994c---xumoxixalatasuponikame.pdf
    • http://illinoislivestock.org/userfiles/file/kuvajibegofikofege.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad9837de5---pilolinufopatumavulat.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/377f8c4d619b733218bbb5e347e85c64/zofolujososisadujisaz.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/10803803331.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090324caa061---zatevitepuvoxozubov.pdf
    • http://www.awakohchang.com/image/upload/File/4013011193.pdf
    • https://worldmedglobal.com/userfiles/files/37482733601.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/2bfd89b44b058e81c6a862f327a28f02/16811139625.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/29d46c229a87ddf8de2f5ea33aca3184/dadunebagiteropeporitib.pdf
    • http://tikatalog.sk/_files/file/21102203738.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a35c647e62c---41306538980.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/30244130a7501bc0ddb2fb34d7f219cf/79327115739.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607098a29bcf6---34367118519.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099f14aa1f52---60846442107.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d70da23531---40786549603.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072343887cad---gijenokilitakevokibuxegep.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/vugukamunoveboxeluwav.pdf
    • http://kurpinar.com/img/userfiles/files/ruzoxolimopavitipeb.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee454968075---60098371869.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=black+forest+roll+cake
    • 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
font_00_sfnt_off0000f034.bin
5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 16684 bytes
font_01_sfnt_off000107d2.bin
4bb8beafa04c2e77aa10c50fdc3901fa93debb5640961ca5ee58c19aa082776c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 10276 bytes
font_02_sfnt_off00011f2e.bin
065c7a4f11f9e75f6e8b37807bc82b370f7b2846456f0b3b832c619392bb01b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2E 1824 bytes
font_03_sfnt_off000127bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127BF 16792 bytes
font_04_sfnt_off00013fd1.bin
41e2e63f942b2a457d79aee26f069e913c3d8bcad019ee29b79976f94400aa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD1 19692 bytes

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