Malicious PDF — malware analysis report

Static analysis result for SHA-256 651055cecc4d2d55…

MALICIOUS

PDF

71.5 KB Created: 2021-09-05 12:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: efae148bea416f115b7c164d574b914e SHA-1: 61bf71e876710e7ddb9951cbedbaca44c454c06b SHA-256: 651055cecc4d2d55bc6cd4965af40ec91f7cb4124d94d8a86b5057685e6fe242
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites hosting further malicious PDFs, disguised as educational content. This pattern is consistent with phishing or scam campaigns aiming to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607baf5843999---20605634965.pdf In PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/s9mint8cthvoutt1f8si5lj35o/86435875335.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd346485365---93277936266.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xigusopu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161106c1800a05---vikenibibimoradabuj.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611cfee69da40---3216488875.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c3ce147039---fokonetajanubexixefa.pdfIn PDF document text
    • http://regcureguide.com/files/files/6948319678.pdfIn PDF document text
    • http://lejuriste.ru/files/file/lazovuxobawimowutob.pdfIn PDF document text
    • http://carbonelite.ru/file/wasapipososulalujidegi.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/xesitakixemabowe.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/78649014066.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/37739489627.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/rofubuvufuzeji.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/latapewiposorakado.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a7bc51ffb3---91187021638.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/8j27ackt8b9hltcgturr4bm84q/95746534800.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160933bd3513bc---taponapobafelinitode.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608180baac1bc---sirotevagedixefukoroj.pdfIn PDF document text
    • http://humanlitech.com/files/files/99926050583.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/84846945924.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ac51bff2d---wobowaxegipopegisu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84863a24a0---67363201139.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b821f3212b8---welojumew.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/49784726268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=chemistry+balancing+equations+practice+worksheetPDF 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_off0000b7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A1 15072 bytes
SHA-256: 716676021fff69f614830ced68de78f7bacbb48f8a145802e2adaeeb684a2cd8
font_01_sfnt_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 11528 bytes
SHA-256: 5983dd5b51ea42118d67b65a682c0dd41976e3b7419d9c98f901117439e1852e
font_02_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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