Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc68b9cd8c204bd…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 04:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdec0ec96f38fc61f221ad5c3fdf366a SHA-1: c20f7d103fdf0bcea4c4d591c962192452c5667c SHA-256: 8bc68b9cd8c204bd54a30ca013e8f7447b97a2010c198f0224f72ac9c5ea8f80
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as a malicious phishing trojan by ClamAV and ML classifiers. It contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The heuristic 'SE_QR_LURE' suggests the document may instruct users to scan a QR code, further indicating a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://daugiavanthienphuoc.com/media/ftp/file/dapivuletuvoxitesopifika.pdf
    • https://sapporomn.com/userfiles/files/votogufav.pdf
    • https://vnsteeldetailing.com/UserFiles/files/51229197947.pdf
    • https://asztromiskolc.hu/ckfinder/userfiles/files/16025172052.pdf
    • http://cesnek-vysocina.cz/UserFiles/File/28239758998.pdf
    • https://eownauto.com/uploadpic/files/gemegutisifawadifif.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161328a02e3b0b---75375281945.pdf
    • https://krainaogrodow.eu/zdjecia/fck/file/tomowumesenozetesujed.pdf
    • http://kukubara.com/zdjecia/file/42570747606.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/11091969177.pdf
    • http://creativecoms.net/userfiles/file/jamavopo.pdf
    • https://priscar.com/documents/files/xakosidamawofor.pdf
    • https://netiko.fr/img/Data/file/sadabamoxarisowug.pdf
    • http://asqcert.net/files/files/36881022542.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/46257420422.pdf
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/59799572484.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342646cce76---lokikujusuvadiputumesi.pdf
    • https://abyway.lv/images/ck_images/files/96220144320.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142945cb81d9---24590272506.pdf
    • https://ego-sofa.tw/uploads/files/202109130500078007.pdf
    • http://rajhansnursery.com/userfiles/file/91165316238.pdf
    • http://777mto.info/contents/files/28193431272.pdf
    • https://cuichi177.com/uploads/files/202109031918387189.pdf
    • https://muzpony.de/obrazki/file/96844250184.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mirror+tablet+to+phone
    • 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_off0000be7b.bin
aa394adbb1de3af667afdc1e7a73d06cdeebdac5bb292b8398fb39a0ab725889
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7B 10316 bytes
font_01_sfnt_off0000d569.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD569 16792 bytes
font_02_sfnt_off0000ed7b.bin
a0df2df26e0dfed6b001c72c5aae0890983dac45805dc635205b45149b8f0f08
pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 16460 bytes