Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e76bf53b63fa7a5…

MALICIOUS

PDF

68.7 KB Created: 2021-09-05 21:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c19cd5d7ebf0911c068d01908a64cb3 SHA-1: ff2ca898926ed4f8a59e834b4e6e3b9328808af9 SHA-256: 9e76bf53b63fa7a5cadc4bbcdbba7fde9e717520fde53ce988482681b673bb01
176 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical for phishing campaigns, with numerous embedded links pointing to external resources. The presence of multiple links on compromised CMS uploads and disposable hosting suggests an attempt to distribute malicious content or redirect users to phishing sites. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://bataretak.com/img/files/file/48053884572.pdf In PDF document text
    • http://worldprint.su/userfiles/file/daxawofibonufeweb.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081210cb57ca---8647064594.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ec9ddb73f---zoxokavovuwamazijadututik.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fd0143fc6---vibubogesu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4e9a7a413---3943093606.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f5700f942---tubiwakizituwoz.pdfIn PDF document text
    • http://93564497.com/userfiles/xegux.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934eb8e3fbd---1562035037.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f0beaf13fa54086ee382f000a1f13e14/femukiri.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/990adf5212ccff51b54197edc254c1db/59049628272.pdfIn PDF document text
    • https://moolans.com/uploads/files/runuvuvejofazafosavewu.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/8mpfkjnaouevpgpjkdqqrnenpc/dawulekefipixure.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/wururigejoseluj.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9a9837224---91998626567.pdfIn PDF document text
    • http://huefpdf.org/upload/file/8813673850.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/17817026176.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/natoriborimoxalabamib.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965996f20d7---12388779160.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55847132023.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/89244260628.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c8a0ab2c5999c663acf11bc1992cd177/tidotifazuzu.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/fuvabutegumudozoper.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/09c5a32f44e4ea031ba32b69ef339fdb/fuzewimogesegepegufebake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=axiomas+de+zurique+download+pdfPDF 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_off0000b1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B2 13884 bytes
SHA-256: ee81cbdf9985a1f8663f39ed5d64c4344b6ce8c9abc9a730fc1d29a374317b9d
font_01_sfnt_off0000d3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 11036 bytes
SHA-256: 55af58e03a8bb41ad7d5d36bad3ade0e9c73fc08ef6a9c294b18529f7dfe9684