Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d2c0143a495d18…

MALICIOUS

PDF

97.4 KB Created: 2021-06-27 21:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71db6db055400abd2a7a55e613bffe13 SHA-1: 541496770cf5ba39c5ccbd3c4cb842579df47722 SHA-256: 31d2c0143a495d18c6065b31c0b5433960a8f073e7e0aa4cac8577c6cded1c59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, embedding numerous URLs that lead to compromised WordPress sites, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://wastran.ru/uplcv?utm_term=types+of+glazes+in+cooking
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092598f459a1---10934790197.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/273f698515bbc3f8a9a720c81a3e791b/80685685371.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tjb9rbs349hcrpg8dnhm0mae6m/xenabutuzesadanonukegizor.pdf
    • http://abnicum.com/files/file/gibilugigobara.pdf
    • http://jplus-ag.com/upload/files/BodyFile__60D629817E0B7.pdf
    • http://jjmcp.jp/userfiles/Image/file/6391419204.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/13096918591.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/2667f67f73f50c6c46047c5722b6240c/62538814367.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5054a4b0f---68388936313.pdf
    • https://baxsporthorses.nl/userfiles/file/losilo.pdf
    • http://galettedesrois.hu/userfiles/file/62515604433.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/1iklj6rvsq0mpilcshfkbdjgq7/pomaxizik.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/598f57d48322b1d1efb35f02a6893c42/23944980109.pdf
    • http://clarksville.net/wysiwygfiles/file/112440493.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7b38a522b806e7af345f86948e8f8884/kajexix.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d206e20e5f---73675807476.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c46ced01---tagutiseleromusan.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9c2238077---vogunivinomu.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f296eb79115ed450183e9f4f2ac6a115/14365389311.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c86f5377f5---33256794114.pdf
    • http://ehomeforeclosure.org/images/file/3364896190.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73cc5e6600---kubusu.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b3d4838cf1c93a3b41146736e6198934/jedofometosot.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/608a125181c8b8df001058bdc8719d73/79432391168.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/60a0c848311790a0fc1863850baac081/zisimarinobezuna.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/r5bqhio2hjjkmrn6cunpfcnm20/wikufatosure.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119da.bin
0752efe65ecf186142759fa615070ee869c69b4cdacc02cd197067ca00b193f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x119DA 17460 bytes
font_01_sfnt_off00014745.bin
7577ea54d66a263a37607dead253299fd223107cbf2b3210647e199ee709771e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14745 10684 bytes
font_02_sfnt_off00015ffd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FFD 16792 bytes