Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07a3833015bf21d…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 17:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3572ec33af77cf67f3031fb492c3d2e6 SHA-1: 965f5cd3747e91006cfd1759f83ca2ea7cea56eb SHA-256: a07a3833015bf21d07f759eb2b3866246c71e34d57bf68cc03314f68bedcfb25
164 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. This suggests the document is likely a lure to download further malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c69b3d6044---kevune.pdf In PDF document text
    • https://labelmarket.eu/data/file/83489467201.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210912085629.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/05d14f08fc0353273f245cfa06ca1426/82098418658.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/surimobegopuwida.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613805bde9ac9---94873900850.pdfIn PDF document text
    • http://teifsepahan.com/files/file/10457999698.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3b1e90b9---fogujakakuwed.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/92131729030.pdfIn PDF document text
    • http://indemo.pl/Image/files/40109739697.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091214080673499.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/22706441262.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/bigoreve.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/runofirakejawekasideg.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/wigatafukudozarudut.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/savudojevawovolumajidetox.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/61401397936.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5hd39fm8aepr6v0mjn5gc2qe02/6891816185.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/lipabidokub.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/59372697406.pdfIn PDF document text
    • http://ladna.pl/user_images/file/85488987034.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/27223734423.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210904210501.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/biber.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301ce71f787---574359982.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/67574784546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+radio+app+android+australiaPDF 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_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 10536 bytes
SHA-256: a26a1e4f29eab9c60a68ff01dc7ee3a9a242f2a8451cde02a371c1d18838258a
font_01_sfnt_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 19056 bytes
SHA-256: bed8f8baaffcb1972890c30b837064e832711cdc92a0c642ac02701f02c19188
font_02_sfnt_off00012da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1