Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d724eb215432422…

MALICIOUS

PDF

87.7 KB Created: 2021-07-13 23:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 682147e7624f814abdbc95f5bcb18e15 SHA-1: 25c327e85409d0599bb4da0161ed56ed034028c7 SHA-256: 3d724eb2154324222ce4def13e85f55d6a78098a489b3c15c74e051392aa4e07
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are flagged as pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious lure designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/4ql72ddnikftsvoperuiek8ocl/sidekewe.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fda8b0c15a---xinaxoninalewijodeva.pdf
    • http://majesticcaliberenglishlabradors.com/clients/a/a7/a77fae3751d16767b5fd1969bdae34dd/File/goforoweni.pdf
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/57092295235.pdf
    • https://zegaoyun.com/calisma2/files/uploads/fozapejobaboto.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160797a4cb00b2---voruxewasewidexik.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984ea56bc1d---bamuf.pdf
    • http://remont-etalon.ru/upload/files/60033719337.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755004a4142---59592727485.pdf
    • http://owv-sad.de/userfiles/files/48667047666.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/a4e69feupiukprc7tm9l3pv1aq/66866102581.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e5527e8ef---29553929420.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b147e8ab3d1---pirobut.pdf
    • http://gekon.net/userfiles/file/33329307576.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/184f5dc447e2b3fa9fa1f46c50a91418/wugugixawimokopavin.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/41166266565.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/a2903938bbce44e5fb21bdcab5e75016/puwuxevinek.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/23191067f55b5aefc56c553173287b10/15093165179.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/2gckk2qk7c1n6g9errnk3ks7v0/97040316215.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/333e86eb32dfd9d848d6d0ce79d91160/gobagaseperad.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf5ed7d238---vorimefakesuda.pdf
    • https://humicdp.com/uploads/2021-07-04/images/files/mujaw.pdf
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/95ff95671c0319659c60e45ec8368be6/78739290601.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82bdbc991e---zuvanapikuzajemuxomite.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/us2bmo9becahlkhoehv2dgtatn/kabikejizorobiwejudefuji.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jesus+is+light+of+the+world+bible+verse
    • 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_off0000f3a3.bin
2f8caca3ea6971c8537a68050867e263b25b65a23f8cc17d5a93ad1748f63fb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 17500 bytes
font_01_sfnt_off00012064.bin
94053d61f24ee3b35f1284bcb6df13ab80b0a2bf97685ff6a94fbcd7d5c46c6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12064 10752 bytes
font_02_sfnt_off0001391b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1391B 16792 bytes