Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2a2b8e5b1545b3…

MALICIOUS

PDF

85.5 KB Created: 2021-07-20 19:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 69a1b649513256e415a9c7f19fd564f9 SHA-1: f43d76820393e3e2e8c44ac99fe31878179e5589 SHA-256: 7f2a2b8e5b1545b3fde8e7d6cb615adda96d67e4a05bce7ca17ed669cfde3722
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to compromised WordPress upload directories, suggesting it is used to distribute malicious content or redirect users to phishing pages. No scripts were extracted, but the presence of numerous external links indicates a likely attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://moscowprice.com/content/xuploadimages/file/jugiwiboxefutiguwuko.pdf In PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/56985283191.pdfIn PDF document text
    • http://arablift.net/userfiles/file/27484962426.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608289853b569---gawotevopimekuxegavam.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/32183292962.pdfIn PDF document text
    • https://factinet.com/uploads/files/rifunoje.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/xorovubopewufurumalajekuv.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f5d6ead7608ace66969dc08566d25e9f/48910224599.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c326e560677---gonizebefiwux.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b1d6643582922a4edb8a912a7920ab4d/daxefefijapowafe.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9087469e9d---fojozogilulox.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160afe6e6d6302---34441408283.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/donusewawobuzepopaxazo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074a773dc5e9---limatu.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/37327725859.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/kogitawevajarani.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/pekekute.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/pebuvumulofimivifefo.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/51463364165.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160d1989ea4e74---85390070050.pdfIn PDF document text
    • http://shophouse.info/images/files/dugovokojem.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/7883627039.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/71293562123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+meaning+of+quintessentialPDF 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_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 10768 bytes
SHA-256: e2f9ab74a1ffbdb55b5b075a94f332d90790aed6b7f92f995c58adcc54ecd8ba
font_01_sfnt_off000101cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 17400 bytes
SHA-256: 9e1f7608524ae7dc9dc985c119a9574004340bc5407a771d706110eca6427193
font_02_sfnt_off00012eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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