Malicious PDF — malware analysis report

Static analysis result for SHA-256 199b4d759b7dd5d2…

MALICIOUS

PDF

117.3 KB Created: 2021-06-30 16:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fc5352aab5a3d6f951bca72886106a91 SHA-1: 44caa93b8c5fb1a28472047bb017bf17d59ff761 SHA-256: 199b4d759b7dd5d253c90e59a2577c1872df387744147e42660317a713bbf483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/70b7d070c22cb7fabbc05531f51b9b22/78043023596.pdf In PDF document text
    • http://boilerservis.ru/uploads/files/54668744321.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/pml0bivjk94dl8icqk0vj7fbum/32530542780.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6df50baf---xubikevo.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/ae1bd5d46d5e16c6c24e47081394574b/kopevikaxuj.pdfIn PDF document text
    • https://wecareprogram.org/images/file/mobifupom.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/3f073a8aa36489282a5c747cd1fb6da9/28139956409.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0ji3j4ovkpu5tl07a1mn2k9v9v/bipowazozebemuvawu.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8f8d499a98e90bc5815e6459d858d44f/19344285319.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/xiributaredaxebipu.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/zulekinitiwelu.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/suroxijegezesozenosub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797acfb5736---zixewulitumoriganorikedoj.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ikqv2vrhf4124dmpedmdthld4f/19949009624.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/gizixivunitivadaf.pdfIn PDF document text
    • http://gptools.net/userfiles/file/walivipobokovifokirokuru.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/b89d81d03a376aeb4ed3c9c3ae938fdd/64572839568.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a38ae36594a---lavoji.pdfIn PDF document text
    • http://soupworld.de/upload/file/24224531852.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ade835612e2b5e333b8a8bde9e4ee6af/luzonesi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a92adcfa1---82985089764.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607317d5d4452---juluziwo.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/aa69e1da36c4936dccb59bf768c28ad3/rowevekegenefevuwusif.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4e47f1b69b3ab54af34abaea4c25a21d/koviji.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/o9bb8eg9m2fcmi0c7irpnv3mk0/nadizevefikosenemagevumax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+holiness+of+god+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CF0 16900 bytes
SHA-256: 72309e2cefa9d43521cfbcc15c8e1a4db912bb081dc04233a150a103fb6a8905
font_01_sfnt_off000198ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0C5 10380 bytes
SHA-256: 75b30c739b7b3f48d352f5878265046d8328bb49ce3cabf260b97686f5197767

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