Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d150cba01d38ab5…

MALICIOUS

PDF

93.5 KB Created: 2021-06-28 23:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d899a4c7d81f0b2967907f5ef53fa47b SHA-1: 1bb3ad788be0c5cb42c40929075a2e21855c891e SHA-256: 5d150cba01d38ab570f10e259f0d02d6d3a240844c1fa41c12d863c1525bcdb6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories or disposable domains. The primary purpose seems to be directing users to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/33b49f97106ac53d9436c03ec2374217/925117693.pdf In PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160722fc44eb13---30474205025.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe42ce5aa3---49267951793.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/56109539063.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ok9evtpnp4a9ru257rps09bq31/tajafomivironoseneragigin.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfead045fc3---xozowodukolid.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8e7bbb77b---xitabejibamenijepa.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/50818ad8697be30b796419380bb5bfef/rosovejigosogebi.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/32779687938.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4f6058ca0---fumawojeruvugibafakeret.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/51b53610ff2f6591b9862ccc4b4cd9c3/85915597554.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdea7a9077---44937871909.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1o49b722nvf75gi0mb88ci1oe5/refemuradimokax.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/aa4905b183d05cdb425af0f027ab30c0/87208203220.pdfIn PDF document text
    • http://grupophi.es/uploads/files/fixejikoxevoxowib.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/60ea2be7c3da5e36537c1a8f47fc6eba/18693338846.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ccb4e75e3---befomeso.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9069d2ee---80863319570.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aae80c062---govebupepufugotogoxuwupo.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/potigepiwatenezotosatob.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b47159ef386---sanuvirizadoxufipafet.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd83b1f9af---wavekik.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210611_BBB7DB890CCEF49F.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ratatouille+with+fresh+tomatoesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001320b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1320B 18288 bytes
SHA-256: 10358852252c99c91e221e32901cbcfc3b5cd5cd68ed31e0c1903624227117d9
font_00_sfnt_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 17404 bytes
SHA-256: 1889a9ef22103c2cb612788cd77140e1083a5abb6720bff4309580729a79b481
font_01_sfnt_off000119fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E41 10608 bytes
SHA-256: 77fa11e5486aab364474d2d2960425751cde73d4e19cd18711a5be453460001f