Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2746d1d86ac30f…

MALICIOUS

PDF

86.3 KB Created: 2021-07-20 00:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 62b91f9c618cb633c2bcbdd00e2772eb SHA-1: b695a2709024456918b2414d8580e103d6b907e2 SHA-256: 5c2746d1d86ac30fa0eba5736215211d7d3a2b7ae904917ed0c8f572e382c7f2
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm or redirection scheme. While no scripts were extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://zae.me/datafiles/file/26579174646.pdf In PDF document text
    • http://come2menorca.com/images/file/vuxowavositoxunopok.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/zinumot.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/gemavijesumijew.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/fuvikurarevifupipamaroziv.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099fde988795---15728775638.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/zozipunodugozovenet.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/xesupex.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/vukepurewelufijuvixaza.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/533d5d6d12edcf97516521e773b89923/87373847735.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860d4463644---zeniziwazuguminub.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/btms3drktqc3ls9kp7qtkt1fms/pugepulopojuwo.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/jarez.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/9julli41f80383n5b8cfh1auv0/64998836138.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/tedavakobemob.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/5061917954.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/76313669625.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/529a932f7cd4fd49fada6680aefc3c02/61393797968.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a375a7c46---miromela.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/widefadofutigiwad.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/kijejuxorowazi.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65c28d8a3---80248428686.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/18934116115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=top+4+oil+producing+countriesPDF 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_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 10668 bytes
SHA-256: 4380357283ec88c048ee16084099a3260febf598695b0ed21df899f8da05978b
font_02_sfnt_off00011b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7B 18300 bytes
SHA-256: da468ab8c5f598997482515c9d7760eab7a389d59a102b9c86e90245288c8589

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