Malicious PDF — malware analysis report

Static analysis result for SHA-256 1250ec02d663aa01…

MALICIOUS

PDF

73.6 KB Created: 2021-09-19 08:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0cb7d29a66c56ee874726a13b4315593 SHA-1: e406093040d1f5eb9b39210abfc22d8a84b3d4c4 SHA-256: 1250ec02d663aa01795dda6db8ca77b2cf38d520039797c7ca66155c6346d214
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. One high-severity heuristic specifically flagged a PDF link to an algorithmically-generated URL, indicating a likely attempt to obscure the final malicious destination. The file's structure and the nature of the URLs suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=7+letter+vegetable+starting+with+p PDF link annotation
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd592398cf---rutap.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/273991fbf84078e06f482c36b8648e2b/baxigatipusezafonupo.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/45352993505.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/fujoxafirapateviporot.pdfIn PDF document text
    • http://afro-safari.com/upload/files/nikosofajulezajezevugite.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614421eead54e---93561286333.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/sibivetezugatixuvowave.pdfIn PDF document text
    • http://fxlcd.com/upload/file/xubevu.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/xameleparojenixijezog.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/lepavesapopolariripab.pdfIn PDF document text
    • http://huiking.cn/uploads/file/011231327355.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/35702670690.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/55767758582.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/rusizesis.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613188ea4c6ee---mexuninawuwival.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/mulenedogemafuwexesu.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/fuzizoginifojujamiloz.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/14729928111.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/95181671793.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/lidikuk.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/kagumivo.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/273806805.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/89852222203.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59d6b1685---17646185235.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/niniwanejodejat.pdfIn PDF document text
    • 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_off0000c04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04E 15728 bytes
SHA-256: 1394f1811d69b3aeb8574ad7dd88b6805596133dcea8aed6e706dab53959a99d
font_01_sfnt_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 10656 bytes
SHA-256: 0691b649c9431e862e2f11c64ba15858a8d79a613eaef489cf5f225e33334b37

Open this report in the interactive analyzer, or submit your own file for analysis.