Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a8dab579e2db79…

MALICIOUS

PDF

109.1 KB Created: 2021-06-30 00:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f8adbd53640e129f5e6dfcd3da55b2f SHA-1: ea79a26983b46c01438d3edf9a8e4d2dc21bf272 SHA-256: d4a8dab579e2db79319b9e29cba000f604be1d21c5e56a776f9ea777e79bfcef
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092183d1e5f1---42062704006.pdf
    • https://alamansyria.com/userfiles/file/37789150295.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/bavufazosutinixekafubiwid.pdf
    • https://qqhanoman.com/contents//files/nekunenusipudetem.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accf9234a04---47900481277.pdf
    • https://travelstore.tn/userfiles/file/disenusafeboxugoresusakuf.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f0gap7039mb05sb033rodae0n0/gesekozu.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa22b5a7de---bolezavanibirinurawudiput.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/vitebeva.pdf
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/ruvofemifitadixe.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607411539367a---13776659506.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/rdrmalespc3lbmvvj48sf5p1nl/76259703605.pdf
    • http://artgraf24.pl/userfiles/file/35962137442.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/6fceb97da1853129b528797f5c53a8b5/96956876091.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47051a6f9a---kikekijemaxofu.pdf
    • http://amirafouad.com/uploaded_files/file/76531131898.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/cn8mfkqlhbugm5lv249li6un2d/15072636054.pdf
    • http://jcon-aps.dk/userfiles/file/gezumaveguge.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831f9c392eb---jedoneso.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/v85jev3150dl9dbfm3hknvg656/vixuwexefera.pdf
    • http://marinapogon.pl/upload/file/40413763101.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/nepevidetiwa.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/39fa71052aff0bbb1da0ff9d6747f0f5/fevarojovenama.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=star+of+wonder+star+of+night+christmas+song
    • 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_off00014812.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14812 16792 bytes
font_01_sfnt_off00016029.bin
0806bfdb67b62784aa52c4e212e29115d9b36ffbd6217a71ce70ed2464d13992
pdf-font-stream PDF embedded font (sfnt) at offset 0x16029 11040 bytes
font_02_sfnt_off00017981.bin
bce7052bbe872509c2326424667f0426785c359b51b43f7e3cc36a8150a49e07
pdf-font-stream PDF embedded font (sfnt) at offset 0x17981 17388 bytes