Malicious PDF — malware analysis report

Static analysis result for SHA-256 167177491169bf02…

MALICIOUS

PDF

88.3 KB Created: 2021-07-08 00:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4b279b5784e01458e86780001382ec69 SHA-1: a61ab6c9645d8d29f3cf575221263011b7941422 SHA-256: 167177491169bf02f409dd7ba82e93369637302ca3371dad3bb3c37b18fa0074
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The embedded content, though heavily obfuscated, suggests the document's purpose is to redirect users to these potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef9067bea0---36303036254.pdf In PDF document text
    • https://agrimal.pl/userfiles/file/sagisosudafanufijufuxa.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e12e8bfcf32b35f9c7a292c11ee9dff0/morowuvibunoxusi.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/tebafi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/icd2q7idjkh4u5scbd3gfdkbn1/tusetezanuxidozugekafinem.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/sozesevefogimara.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd20e3db74---29546166377.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/regaruxibunefofipamud.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/pajidijejanulerogobuli.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3qu07l9jh30hmt8slu7uu8rhh1/getaru.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d4fde8304---32091057880.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094870102009---47755511574.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9eegkorg1a6a4dpc25i0h9jis4/59606824780.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/8734da18cdc6a6b49590e378bba57dad/11136009373.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/209e6790a017b7b01c90f9eaadacc40c/20277724513.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a853baba87---xotekivezowase.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081039949a57---vigenezulona.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f7b364b17---54228962798.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c77e02f3c89---lopekikapodig.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/vebodaloxax.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/52688564203.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/56296209191.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f05c570f3---wipojivizaduto.pdfIn PDF document text
    • https://marosme.ro/hirek/file/36114244734.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/3me8jvjo0pivk14925hogpg2sf/nosoruvajobifuparevepemi.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/50544949850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=simcity+education+guidePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 10688 bytes
SHA-256: 9bcc66b52ba7e9fef55d725417494ffae22cba39258983e3c39110a235d5d585
font_02_sfnt_off00012704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12704 17148 bytes
SHA-256: c46e208a92bd8fe42a26bbee5743ffaad85e1c2ead1aef63871b05bf70143b93