Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb5aa04dd1aa096…

MALICIOUS

PDF

68.5 KB Created: 2021-10-03 12:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d86ad7b2d0b0bd57945a5ebfe8697bdb SHA-1: 217a7711da537c6c4c5e9f2906c836a4b30dcdf8 SHA-256: 9cb5aa04dd1aa096c57b8f724da0b0ceae143ee67719572be60ef04ad60414ff
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains a link farm pointing to various domains, many of which appear to be compromised CMS uploads, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, reinforcing the likelihood of it being a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • 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://interconformity.ro/images/file/14210821455.pdf
    • http://dachastyle.com/userfiles/file/51019158320.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/177ded35849eb315caca996f5847e531/birapejopureranir.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8fbaca95---11654519481.pdf
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/kelegawinami.pdf
    • http://kukubara.com/zdjecia/file/pajubij.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614696b7d19fb---61647435319.pdf
    • http://indcms.testingmachines.com/images/file/megisifozajiweri.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/wokali.pdf
    • http://rkenterprisesonline.com/FCKeditor/file/xixawalinu.pdf
    • http://candybeauty.vn/upload/files/xelaludovugilosak.pdf
    • http://firewheels.pe/userfiles/file/pekujumifetezaxinu.pdf
    • http://huynhgiabaohotel.com/uploads/FCK/file/51094406191.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf525ba049---70781627193.pdf
    • http://hoangminhphatkorea.com/webroot/img/files/tarawoliril.pdf
    • https://kligi.viart.lt/ckfinder/userfiles/files/15778995296.pdf
    • https://lotusmarinevn.com/upload/files/vazuligamik.pdf
    • https://shopexpert.com/app/webroot/files/userfiles/files/zexun.pdf
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/saxadun.pdf
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/56752683476.pdf
    • https://rusepress.com/uploads/wysiwyg/files/furolisavow.pdf
    • https://crmsaas.dswip.com/ci/userfiles/files/77899240569.pdf
    • http://escrima-rlp.de/userfiles/file/dekesibow.pdf
    • https://yesilkoyluleriz.biz/resimler/files/pivuzagibu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=good+morning+handsome+have+a+blessed+day
    • 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_off0000ae12.bin
8669d291fec63549a628086940e0a138e95915d7ca14a49506cc8705a529daa6
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE12 10956 bytes
font_01_sfnt_off0000c714.bin
f52f133bac8377cd230e5fbb9acfc4e75916d7ca68d4bd47b0dad86ee129f1fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC714 14240 bytes
font_02_sfnt_off0000ea60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 16792 bytes