Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7a8e44479fc1cd…

MALICIOUS

PDF

86.5 KB Created: 2021-08-14 20:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2ded98bbdb451049427fc50c15ae5b1 SHA-1: eb49f7f2f1bd0d1937085464e7b40cd81e2dde05 SHA-256: fc7a8e44479fc1cd9aa2395366a78e8eaceef5757f93c386e3b4bb97f7d7979b
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download' button lure further supports the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ebcbae01---fifomirazunuxuluvazofeb.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107a252729f1---jodiwimisetivabet.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/j72isrd3a3kqo760og7e9vqa27/vemozujijizodipixigamoxu.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/360qr5g2pi8s1khuijmn5r3bj5/19690703693.pdf
    • http://zuche0551.com/upload/file/sosiba.pdf
    • http://dambi.pl/userfiles/file/nugavowexozitekuvudubosa.pdf
    • https://tort-art.ru/userfiles/file/18478496243.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb49e03697---37696732714.pdf
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/rudosibaxalezebamogininag.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609099ce631ef---96081405930.pdf
    • http://eakqshop.com/ckfinder/images_store/files/xipoxevisopokerowofimab.pdf
    • http://sushibelovo.ru/files/gimixajarifaxezarasalaxi.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/09d840ba2003dddc98fb51b2ce0618ac/43796084073.pdf
    • http://firewheels.pe/userfiles/file/66697837086.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160763ca657055---dunurinufasuvobek.pdf
    • http://alliance-ltd.com/userfiles/kifepakutorabowurava.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9f367fef---nojufozawuwuji.pdf
    • http://thermcom.cz/userfiles/file/geduxusid.pdf
    • https://bywuf.org/upload/editor/files/padovutigitigakejujin.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/10670311b1c0b1c02bf665d6ddd081f8/jigijuwinexepuzozetofez.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a226e992c5d---kavivelipebufaneduzil.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d01a1ac80d5---16105890648.pdf
    • http://eaas-journal.org/survey/userfiles/files/genokexezaw.pdf
    • https://andrejc.si/files/file/63742147827.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec5263d273---venijitadux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+i+turn+the+camera+on+my+hp+laptop
    • 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_off0000ef18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 16792 bytes
font_01_sfnt_off0001072f.bin
e4bd0259494a6572d4921f3e55e884b4072b65d187d320f614680887657d3ee8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 10900 bytes
font_02_sfnt_off00012032.bin
7965a0d567f970dbb78df22df0ed9dc481afb18252d23cfc0db8d75969e8a6fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 16956 bytes